dr. joshua weiner, good morning. >> good morning, barbara. >> this is an interesting topic. i think we have a lot of folks waiting to hear what you have to say about this. you are going to quiz me. >> let's see how you're doing. all right, so, the first question i have for you, what do you think the average age is that most girls start having sex? 15, 16, 17 or 18? >> 17. >> ding, ding, ding. you got it. you're right, 17. so -- >> i'm surprised i got that one. i was thinking it was going to be younger. >> i think a lot of people believe that girls today are having sex a little earlier than they were in the past, but girls are waiting than they did even 20 years ago. now, the number for boys is also about 17. right around that age when kids are starting to experiment and have sex for the first time. >> so, statistics from ten years ago might have been younger than that. >> yes, exactly. little bit younger. it's creeping down decade by decade, just by a few months, but going in the right direction. and, actually, they're using, kids are using protection more frequently and les