In Europe we really have a different opinion on sex and nudity. Over here gore and explicit displayal of violence, dismemberment of body parts and such is considered to be offensive, sex and a nice pair of boobs are not!
Exactly, and IMHO that is a much healthier perspective on life. I too grew up in Europe - I went to museums and art galleries from a young age, saw beautiful statues and artworks depicting the human form, it was just culturally acceptable. Even religious art often depicts and deals with sex, nudity, rape, etc - all of which are mentioned in the Bible. These are human issues for people to talk about, not sweep under the rug and hope they go away. And there is no shortage of breasts depicted in religious art from the Renaissance period.
Restricting human sexuality so much that even education about it is denied to young people (as in many places in the USA), is what creates some of the problems GM4Him describes above in the first place! Twisted media portrayal of sex, sexual addiction, etc. Sex is a natural human impulse, and it's only fair to explore it through stories. Also, if teens want media with sexual content, then trust me they will find it.