boy i want to go go go this is "nightline." >> tonight, celebrity twitter war. over kim kardashian's naked selfie. the sexy star slamming her haters. and an unlikely ally for kim k., kanye's ex amber rose telling us why she's now defending kim. >> if any sexy guy posted a nude picture, everybody would be like, he's hot, he's sexy. it's just a double standard. >> but it's not just hollywood's problem. we explore the very real consequences of social shaming. plus just call it nascar on ice. we're with seasonal speed demons in frosty minnesota where the only thing harsher than the

but first the "nightline 5." if you have allergy congestion, muddling through your morning is nothing new. your nose is the only thing on your mind. and to get relief, anything is fair game. introducing rhinocort allergy spray from the makers of zyrtec. powerful relief from your allergy systems all day and all night. hasn't your nose been through enough already?

>> number good evening. thanks for joining us. kim kardashian has built a multi-million dollar brand largely on her sex appeal and some might say oversharing.

week sparking a celebrity tweet storm. the backlash shining a spotlight on body shaming and social media attacks, issues that reach far beyond the glittery confines of hollywood. the woman who broke the internet is back at it again. this week kim kardashian tweeting the self-censored nude selfie with the caption "when you're like i have nothing to wear lol." which should have been just another sexy snapshot drawing millions of likes drew headlines instead when it sparked criticism from some famous names. and sparking an important conversation about what women should and should not do with their bodies. bette midler among the big stars with a strong reaction tweeting, if kim wants us to see a part of her we've never seen, she's going to have to swallow the camera. and chloe grace moretz reminding kim to teach young women that we have so much more to offer than just our bodies. the backlash nothing new for kim.

the target of taunts from strangers. but kim may have finally had enough. this latest celebrity twitter feud setting off a flurry of late-night tweets with kim hitting back at bette. i really didn't want to bring up how you sent me a gift trying to be a fake friend then come at me. calling out chloe for posing partially nude on the cover of "nylon" magazine. the war of words turning the wild child mylie cyrus into the arbiter of good taste weighing in on instagram. tacky. asking those involved to come together and try to create and bring jobs to other women in desperate need. the public spat is not just fodder for gossip, it's leaving some to wonder if the criticism against kim is just a form of public shaming that could be sending a confusing and dangerous message to young girls. amid the firestorm, an unlikely supporter.

i think she's a great mom. kim. >> reporter: model and actress amber rose, the former strip history came to fame after marrying and separating from rapper with khalifa and dating kim's now husband kanye west. >> people think me and kim are arch enemies and we're not. we literally text each other all the time. we're very positive towards each other. i'm a mom, i know how hard it is to like work out and try to get your body back. but at the same time embracing the fact that your body does change after you have a baby. >> reporter: amber says she came to kim's defense as a way to stand up for all women who come under fire because of their sex appeal. >> people feel like kim is just famous because she had a sex tape, and i'm just a famous ex-stripper. we're not able to be mothers and still be sexy because we were ex-sex workers. >> reporter: kim vented on her

please move on from her sex tape, made 13 years ago, writing, it's 2016, the body like enough is enough. i will not live my life dictated by the issues you have with my sexuality. you be you and let me be me. >> if any sexy guy posted a nude picture with a little black strip over his private areas, everybody would be like, damn, he is hot, he's sexy, look at that body, he's a dad too? it's just a double standard. >> reporter: an activist who travels the country raising awareness on body and sexual shaming. amber fronted what's called the slut walk in los angeles last year. a public demonstration against sexist double standards and victim blaming. >> i want to thank everyone that came out. you guys are amazing. i love you guys so much. >> reporter: experts say it will take much more to undo years of

from the public's vilifying of monica lewinski in the clinton sex scandal to movies like "easy a." >> everyone is calling her a dirty skank! >> reporter: "mean girls." >> a little byotch. >> reporter: the finger wagging when caitlyn had sex with one of the guys on the abc reality show. >> i didn't mean to do anything that would cause anybody any problems. >> reporter: girls are expected to walk the fine line between sexy and slutty. on celebrity instagram feeds they see immediately the more skin you show the more likes you get. but unlike boys they're punished for being too sexual or promiscuous. it's a double standard learned as early as sixth grade. at recent study of 15,000 adolescents showed that girls who admit to having sex saw a 45% drop in peer acceptance. boys, on the other hand, saw an 88% boost. >> i'd gone through puberty

>> reporter: emily was 11 years old when she was first called a slut. >> knowing that people thought i was just a slut really had an effect on my self-worth. i had to cope in ways that were really harmful to myself. i turned to cutting my wrists and i attempted to commit suicide a couple of types. >> reporter: there as very real and dangerous consequence when girls are ostracized, often by other girls. >> i'm worried about teenage girls and young women. >> reporter: liora is the editorial director of planned parenthood and the author of "i am not a slut." >> they often turn to self-drawer coping mechanisms because they can't handle that public humiliation. >> why is it important for girls to look up to diverse role models? >> girls and women need to have many role models. the kim kardashians and the hillary clinton hillary clintons. we have so many skill and talents, we are more than our bodies, we are more than our sexuality.

have so much more as well. >> reporter: she created the unslut project for girls to share similar experiences and seek support. >> almost every woman i speak to about this project has an experience with slut shaming. either the target of it or witnessed it happen to a friend at some point. the idea of a slut in our culture is that it's mutually exclusive with everything else. you can't be a slut and a good mother. you can't be a slut and a successful doctor. we can overcome it and we can make the decision to not buy into it and to support each other instead. >> reporter: some stars already taking this to heart. amber rose making it clear that she will continue to support kim regardless of her ongoing feud with her husband kanye. >> he has slut shamed me on numerous occasions. and that's why i don't particularly care for him. >> i take 30 showers before i got with kim, you know? >> it was very immature and

and untrue. because it's just so far fetched and just stupid. it just didn't even really make sense. after he said that, he needs to take 30 showers after being with me? i want an apology for that. >> reporter: amber says she's not dwelling on the negativity, focusing instead on building her business with the app company based in berlin. users create an amber avatar and pair it with their own voice for messages. >> i know what i'm talking about, i know what i'm passionate about. but if i want to post a naked or provocative picture, that's exactly what i'm going to do. because i don't have to make you happy. i make myself happy. up next, racing cars on ice. one group of speed demons making the most out of those brutal minnesota winters.lps guys with erectile dysfunction get and keep an erection. talk to your doctor about viagra.

do not take viagra if you take nitrates for chest pain or adempas for pulmonary hypertension. your blood pressure could drop to an unsafe level. to avoid long-term injury, seek immediate medical help for an erection lasting more than four hours. stop taking viagra and call your doctor right away if you experience a sudden decrease or loss in vision or hearing. ask your doctor about viagra. red lobster's lobsterfest is back. so come try the largest variety of lobster dishes of the year, like lobster lover's dream or new dueling lobster tails. it's a party on every plate, and you're invited. so come in while it lasts. this is a body of proof. proof of less joint pain. and clearer skin.

...with humira. humira works by targeting and helping to block a specific source of inflammation that contributes to both joint and skin symptoms. it's proven to help relieve pain, stop further joint damage and clear skin in many adults. humira is the #1 prescribed biologic for psoriatic arthritis. humira can lower your ability to fight infections, including tuberculosis. serious, sometimes fatal infections and cancers, including lymphoma, have happened, as have blood, liver and nervous system problems, serious allergic reactions, and new or worsening heart failure. before treatment, get tested for tb. tell your doctor if you've been to areas where certain fungal infections are common, and if you've had tb, hepatitis b, are prone to infections, or have flu-like symptoms or sores. don't start humira if you have an infection. want more proof? ask your rheumatologist about humira. humira.

we're heading to a tiny town where a group of racers is breaking all the rules. driving cars on ice on a frozen lake. rough and tumble vehicles pieced together from junkyard finds. rebecca jarvis goes home to minnesota to meet these winter weekend warriors. >> reporter: slipping and sliding like this may be your worst nightmare. but all across the country it's becoming the ultimate thrill seeker's delight. this is the wild world of ice

think nascar on ice. so i've come to my home state of minnesota where i've heard that in the sleepy town of laporte, winter doesn't seem to be slowing anyone down. >> coming down to ice racing, just a great sunday afternoon activity. even if it's just to grill. >> reporter: every icy weekend, anyone with a car and a stomach for speed can compete. of all the drivers revving their engines, there's just one woman. colette houston, known to friends and family as letty. she's among the top five contenders this season. >> it's total girl power. you just feel like so -- i don't know, pumped up. >> how does it feel to have your wife be the only woman out on that track? >> actually makes me proud. she's the only woman that does it, pretty cool. gives me bragging rights. >> reporter: husband ryan is a police officer. >> that's the lovely work together. >> reporter: together they spend free time on the ice. in these close quarters, doing

>> here, fishy fishy. >> reporter: or duking it out on the racetrack. >> follow right, follow right. >> you're competing against each other. >> yes. >> how's that? you work out all your troubles on the track? >> we do. >> they make us start next to each other. i don't know if it's a game they play or they're testing us or what. >> reporter: one final race to go this season, last-minute preparations are under way. >> shake and bake, baby. >> reporter: the stakes are high. whoever wins gets bragging rights for an entire year. ryan and letty are facing fierce competition from an entire family. meet the doughtys. dad, charlie, 20-year ice racing veteran. >> not as good as new but good enough to race. i've done it off and on since 1988. i was 16 when i started. >> reporter: his sons following in his footsteps, cody and nathan, who's just 15. how old do you have to be to get a license in minnesota?

>> so before you have your license you start ice racing? >> got to have a permit. >> reporter: mom paula, official score keeper for the league -- >> take these three bolts out. >> reporter: she's on board. >> it's about the fun, it's about the family time, it's about being with our kids, not having the cell phone, not having the television. they're learning about riding on ice, driving on ice. it's a huge, wonderful experience. >> reporter: and i'm learning on game day i may have to ignore some of the lessons of my youth. growing up in minnesota i think every kid, when they get their license, is probably told by their mom, never drive onto a lake in the wintertime. and she was right. driving on frozen lakes can be very dangerous. so before anyone steps on the ice, industrial drills are used to make sure it is thick enough. so this is thick enough? >> this is a little over two feet of ice right here. the sheriff would not let us start racing unless we have 15 inches.

every car must pass safety inspection. >> you've got to have a fire extinguisher in your car, got to wear a seat belt. any kids under 12 years old got to wear helmets. >> reporter: under 12, but not over 12? >> no. >> reporter: why not? >> i've said when this for years, everybody should have a helmet on out there. but they don't. >> reporter: before i can talk myself out of it, ryan's showing me the ropes. >> here we go! this would be the moment, if you're actually driving on the road, that your heart would be in your throat. >> yep. >> reporter: offering up tried and true lessons for any driver caught in a scenario. reduce your speed. >> what's the worst thing you can do on the ice? >> panic. >> reporter: tip two, go easy on the brakes. >> worst thing you can do is lock the brakes up. >> reporter: tip three, turn into the slide. >> if your back starts sliding to the right, turn to the right and it will straighten itself

>> no problem. >> i can imagine 32 cars on that track, all spinning out like that? it's not going to feel good. in the final drivers meeting, a word of caution. >> listen up, slow down. i've seen today a lot of spinning in the pits. that's how you're going to get hit or you're going to hit somebody. >> reporter: the flag drops. the racers take off. >> am i nervous? no, i just don't like the competition. charlie, cody and nathan are all in this race. >> reporter: the conditions are slushy. buddy houston quickly loses control. good news for paula's boys. >> he can do well in this race. that will make a difference for

>> reporter: but then son nathan spins out. in the end, the ice wins. none of our racers come out on top. >> i lost. >> yeah. >> it's very wet. >> reporter: but to this crew, there's no such thing as defeat. after all, another winter is right around the corner. >> there's always next year. >> next year we'll go back at it. >> reporter: for "nightline," i'm rebecca jarvis in laporte, minnesota. up next, a republican debate so old school and focused, it was downright presidential. driving out on the open road together is great... but i think women would agree, getting home... to cuddle up with their man is nice too. but here's the thing: about half of men over 40 have some degree of erectile dysfunction.

ask your doctor if your heart is healthy enough for sex. do not take viagra if you take nitrates for chest pain or adempas for pulmonary hypertension your blood pressure could drop to an unsafe level. to avoid long-term injury, seek immediate medical help for an erection lasting more than four hours. stop taking viagra and call your doctor right away if you experience a sudden decrease or loss in vision or hearing. ask your doctor about viagra. available in single packs. (ray) i'd like to see more of the old lady. i'd like to see her go back to her more you know social side. (vo) pro plan bright mind promotes alertness and mental sharpness in dogs 7 and older. (ray) it was shocking. she's much more aware. (jan) she loves the food. (ray) she wants to learn things. the difference has been incredible. (vo) purina pro plan bright mind.

let's get these dayquil liquid gels and go. but these liquid gels are new. mucinex fast-max. it's the same difference. this one is max strength and fights mucus. mucinex fast-max. the only branded cold and flu liquid gel that is max-strength and fights mucus.

to those keeping count at home, tonight marks the 12th republican debate of this election cycle. we've gotten used to the playground insults, vulgar innuendos, brazen name calling from the candidates. tonight the republican field seemed poised, substantive, dare we say presidential? is it something in water in miami or is it the calm before the storm? here's abc's david wright. >> reporter: tonight in miami, no short-fingered snipes. >> i will let donald speak for himself. >> reporter: all the candidates sought to appear more presidential. >> tuesday night i didn't do as well as i wanted to and i was a little bit disappointed when i got home. >> reporter: including trump. >> so far i cannot believe how civil it's been up here. >> reporter: quite the contrast from the last gop debate. >> breathe, breathe.

>> you can do it, you can breathe. i know it's hard. >> when they're done with the yoga can i answer a question? >> you cannot. >> reporter: all those schoolyard taunts. >> i have a policy question for you, sir. >> let's see if he answers it. >> i will, don't worry about it, marco. don't worry about it, little marco. >> reporter: either bounced off or backfired. the results tuesday looked less like "house of carved sfof cards," more like a trump infomercial. order before midnight and get trump water, trump wine, trump magazine are. >> take one. >> reporter: if only they had a trump chia pet. jake tapper asked about statements islam hates us. muslims? >> i mean a lot of them. back. >> let me say i know that a lot of people find appeal in the things donald says because he

the problem is presidents can't just say anything they want, it has consequences here and around the world. >> marco talks about consequences. and you can be politically correct if you want. i don't want to be so politically correct. i like to solve problems. >> i'm not interested in being politically correct, i'm interested in being correct. >> reporter: that's about as heated as i got. rubio and kasich fighting hard to win their home states. cruz hoping to be the last man standing to challenge trump. >> there's some folks in washington -- >> you mean presidents. >> donald, you are welcome to be president of the smithsonian. >> reporter: there were four of them on that stage -- ben carson now getting set to endorse trump. how many of them will be still standing the next time they debate? i'm david wright for "nightline" in new york. >> the ultimate game of elimination. thanks for watching abc news. "world news now" is coming up soon with overnight breaking news. tune into "good morning america" tomorrow. as always we're online at

good night, america. >> can i guarantee that someone will win the $1 million today? no. but if they do, do you really want to go the rest of your life knowing that you missed it? stick around. it's time to play "who wants to be a millionaire." [cheers and applause] [dramatic music] hey, everybody, i'm chris harrison. welcome to the show. are you guys ready to play "millionaire"? [cheers and applause] all right. for the past 16 years our returning contestant has been envisioning what it might be like to stand on this stage. now he's back for his second day and ready to make the most of his dream come true. from cambridge, massachusetts, please welcome back sanders kleinfeld. [cheers and applause] hey, sanders, welcome back, buddy. come on over. 16 years, really, you've been trying to get on this stage?