No one will approach my daughter unless she seem mature enought to understand the concequences/responsabilities of having sex.
If I had a boy, it's different, boys are usually sexually active way before girls as it's the only thing that runs in their head as soon as they have their first errection.
In both cases, it's all a matter of education. My dad taught me (as well as my sister) all about sex, how childrens are made and how sexually transmitted diseases are caught.
At least, when the situation presented itself, I knew what to do, and not to do. Without proper guidance, I could have ended up with a 18 year old pregnant girlfriend, that off course, my dad would pay for.
Choosing to scare teens with sex is not what I will teach my kids because when they ormones will kick in, they will do it anyway. And without guidances, they will do it wrong. To each it's own way for raising their kids, but what my dad did protected me from being in trouble, and didn't make my sister a slut either (She became sexually active with her 2 year BF in her 19s).