You can't control your kids, they're not robots. You can guide them in a positive manor, which would involve actually talking to them about sex, and offering them the option of birth control if they need it. I mean if parents did a better job being parents then this kind of thing would not have to happen. Who wants a 13 year old to have  a baby and or cervical cancer? Get your kids education, offer them the healthcare they need, and stop being so crazy...