many in this long string of bars in subic bay are owned or managed by americans. many are military veterans. >> they have eight bars all foreign owned. marines, army. it's well organized. just don't understand the magnitude of what we've got going on here. >> reporter: subic bay was home to a u.s. naval base for 50 years, providing a boon to the prostitution industry. >> it's going to feed their whole family for weeks. [ bleep ] enjoy it, man. don't get too wrapd up in your head about it. >> reporter: to see how easy it is for americans to find underaged girls we visited a neighboring town 45 minutes from subic bay. it takes less than half an hour before we are approached by this woman who offers not just young girls but virgins. how many girls do you have? and for each one it is $750. we will talk about it and maybe come back and see you. later that night we meet the woman and the girls near a busy intersection. how old are you? 15. and you? 14. you're in school. what grade are you in? second. so eighth grade. you look very nervous. don't be scared. it's okay. th

alex marquardt, abc news, subic bay. >> our thanks to alex tonight. there is much more to this.ou can see how easy it is for tourists to connect with the young people they are looking for. it all unravels tonight on "nightline." >>> there is still much more tonight on "world news." if you or a loved one fills a prescription every month, tonight, our correspondent with simple steps that can save you thousands of dollars. it did for this family, bringing one couple to tears tonight. it's not what you think. it's a phoenix with 4 wheels. it's a hawk with night vision goggles. it's marching to the beat of a different drum. and where beauty meets brains. it's big ideas with smaller footprints. and knowing there's always more in the world to see. it's the all-new lincoln mkz. you may be muddling through allergies. try zyrtec-d®. powerful relief of nasal congestion and other allergy symptoms -- all in one pill. zyrtec-d®. at the pharmacy counter. how did i know? well, i didn't really. see, i figured low testosterone would decrease my sex drive... but when i started losing energy and be

. >> reporter: we traveled to the subic bay in the western philippines. a hot spot for sex tourism.erican ambassador estimated that 40% of american men here come for sex. to investigate the reports of rampant underage prostitution, producer alex waterfield and i go undercover with hidden cameras. we've been told about this man, arthur benjamin, a 49-year-old texan who's lived here for 25 years. he's suspected or pimping out underage girls from his bar. over coffee, he tells us how he met his 16-year-old girlfriend. >> she needed somebody to take care of her. you know what i want. >> reporter: and how, with the help of his bar manager, lucy, underage girls have worked in his bar. one of them is 16-year-old princess, who has given us permission to show her face. little did benjamin know, filipino and american authorities were planning a raid on his bar. that's it. >> get out, go! >> reporter: benjamin is stunned. that's when we reveal ourselves to him. we're with abc news. you told us that you have had underage sex with multiple girls. >> i've never had underage girls and i do not hav