That is really scary--I obviously knew that people can inherit diseases that are also sexually transmitted from their parents, but I've always thought of it as something that doesn't happen very often--at least in the States.

I'm pretty careful, though. I once stupidly had unprotected sex with someone I didn't really know at all, and was incredibly worried afterward until I knew for sure I hadn't picked up anything (or, you know, gotten pregnant). It definitely taught me my lesson.