From a health standpoint-morals aside-having multiple sexual partners causes all sorts of disease. What has the sexual revolution given us-teenage pregnancy, herpes and of course aids-not to mention elevated levels of cervical cancer because of a sexually transmitted virus.
Of course there is an emotional side to sex. A 15 year old boy I know just tried to kill himself because of a relationship gone bad. Underage kids are certainly neither emotionally nor physically ready for sexual intimacy. No one of any age benefits from unbridled promiscuity.
You would have to blame the parents for that ... clearly they put too much importance on sexuality as "bad" or "Evil". Poor kid.
Especially if you have to worry about STDs.
I wonder how many million Americans have STDs at the moment?