I don't mind, See...Sex is a beautiful thing & in today's world even the teenagers of 17 years want to have sex as soon as possible. Having a GF/BF is like a fashion these days & gals/guys are desprate to have one so that they can brag "look guys, I have a GF, U don't", so obviously desparation is from both sides which leads to sex.
In 2002 when I was in school, Sex in teenagers was rare in Lucknow, now in 2008 it is common. Our younger brother & sisters are doing it & there is nothing we can do to stop them....
The only thing we can do is to inform them about safe sex & that unsafe sex before marriage or a certain age can & will lead to problems. Let them do it, if people think they are mature enough to have sex before marriage then let them deal with the problems themselves, they are mature enough for dealing with problems too.
Sex before marriage should be there, but with a partner you can trust that he/she will not go & brag about it to his/her friends & within the limits of safety.
A very good concept these days is of Sex buddies, or more like one night stands between office co-workers & college classmates. Have sex but with no strings attached, just pure fun between the guy & gal.