Not just teenagers think that.
A friend of mine at work was telling me about what her daughter (who graduated two years ago) said about the attitude at a major Indiana University. The prevalent thought there among seniors (22 - 24 year olds) was that oral sex wasn't really sex.
bcnu,
Mikem
It would seem, therefore, that the three human impulses embodied in religion are fear, conceit, and hatred. The purpose of religion, one might say, is to give an air of respectibility to these passions. -- Bertrand Russell