Brooke, this topic for your research sounds very interesting. I would love to see the result when you're done (if possible).
Anyway, I thought I share my two cents here as my husband and I were discussing something very similar yesterday that reminded me of this thread. I'm not a psychologist or anything, this is just based on observation. I think there are two reasons for teens these days to be what I call “overly sexual”. First is that in our teens, we feel invincible. As a result, we tend to not want to take advice (ironically, that’s when we most need it) and as a result try to push the envelop thinking we can get away with “anything”. We get a rush when we do get away with stuff. I’m 27 now and have passed that stage a long time ago, but I’m sure I was feeling invincible too. I didn’t take nude pics of myself, do drugs or get myself pregnant or anything; that would have been letting the invincibility get to extreme. The second reason IMO is that the world today (and by that I mean mostly North America) has become a big popularity contest. Ppl feel best when say they have 800 friends on Facebook or their friends admire them coz they’re comfortable with their bodies. Adults tend to want to be popular as well, but naturally when you’re younger, your self esteem is lower and the outside popularity helps fill the gap. I don’t think high self esteem is only physical. You are not a strong woman because you are comfortable being naked or you are willing to go through with teen pregnancy. This is just the face of things, high self esteem goes a lot deeper than that. When you are a teenager, you just haven’t lived enough to be at that stage as self esteem IMO is gained through time.
Anyway, I agree with Nanefy mostly except I'm more optimistic about the situation. I agree that some teenagers now are more rebellious and have less respect for the figures of authorities. However, I think the one they are still in minority. Parenting is very important in how kids turn into teenagers and from that into adults. I’m an optimistic so I think most parents are good parents and hence their kids will be good kids.
Sorry for the rambling and good luck Brooke