A question for parents of teens...

[Pigeon]

It's also proof positive that the girl wasn't mature enough for sex -- not if she didn't grasp the importance of protecting herself each and every time.

Let's also not forget that many adults also don't protect themselves every time. It's not exclusive to teenagers. And many people think they are long term, monogamous relationships, including marriage, religious or otherwise, and may be infected by a cheating partner.