as with anything that kids are 'banned' from ... it creates myth and rumour and desire - which can be more dangerous than the truth.
the notion that merely informing kids of things in the world, actually encourages it, is simply not true .. they will discover these things soon enough of their own accord and surely its better to be educated about it, than to be filled with idiotic schoolyard untruths and old wives tales.
the fact is forewarned is forearmed and its always better to get in first and educate, than to have to spend years correcting the wrongs that have become ingrained in their heads.
even today their are kids who think you cant get pregnant on your first time or if you do it standing up etc...
porn is a wholly unrealistic view of sex, and one which young people need to be aware of - aside from the fact that most sex is simply nothing like that, most women dont scream obscenities at their partner, or have sex with the postman within seconds of meeting, one issue with porn is the issue with pubic hair - some men believe that all women are bald down there - or should be, and thats simply unrealistic.
theres a thought that soon men will think pubic hair is unnattractive and expect their partners to shave.
its just a trend that originated from simply making it easier to clean themselves up after a shoot... so i heard.