Not necessarily everywhere PeriodMath (and hello to a fellow Math person), but I have a 20 yo niece who was born because her bio mother was plied with drink at a party by boys who proceeded to rape her. None of the boys would admit anything of course, when paternity testing time came around, and it was before the age of putting videos of such crimes on the internet (that happens with depressing regularity now) but she found out what had been done and by whom via the grapevine in the weeks following the rape.
She dropped the idea of finding out who the baby's father was when many of the boys' families hired expensive lawyers. It was not one bit nice to be gossiped about as if she was the one who had done everything wrong that night, or to be pretty much accused by hot shot lawyers of being a gold digger who had deliberately got pregnant just to secure a meal ticket for herself for the next 18 years.
It was a tight knit community and the boys mostly came from an exclusive boys' school, and nobody wanted to make things too difficult for bright young men with promising futures ahead of them 
. Instead, a teenage girl went through pregnancy and bore a baby she never intended having, and gave her up for adoption so she could get on with her life and studies at third level, all the while having her name dragged through the dirt and dealing with the sneers of plenty of community members. I know all of this because my SIL and BIL who adopted my niece (an open adoption) shared it, in horror. This is not necessarily going to happen in every case of course, but parents of girls would be incredibly naive not to think their daughters are in many cases like lambs to the slaughter when they go to a party.
I have four girls, aged 12, 15, 18 and 23. I have always advised them to watch out very carefully if drinking, to stick with their friends, to take care of their friends and not leave them alone, to call me for a no questions asked rescue from any party anywhere, any time, and for any number of people who want to leave. I have lectured DS (now 20) endlessly about his responsibility towards others and that he needs to intervene if someone is in danger of becoming victimised. So far I have managed to get them all through teenagerhood fairly unscathed but I am lucky enough to live in a community where there are opportunities for teens to participate in all sorts of positive activities and the culture frowns on teens hanging around outdoors together; it's a much more family and education-orientated culture than you see in many parts of the UK. But even so my lectures are necessary and I strongly suspect I haven't heard the half of what went on in their social lives.
You won't necessarily stop herpes or HPV with a condom.