Trust me when I say you don't want it to happen to you. Shit, I was walking down the street at night(here in Chicago) and suddenly I'm being pushed over the bench.
Couldn't see shit but this guy started drooling and going on about how he was a vampire. Next thing I know he has his cock in my ass. Now trust me when I say I'm not gay but I definitely felt his vampiric powers of seduction working on me. Of course it hurt like hell but he said he needed nourishment.
Bottom line is getting raped by a vampire is not a pleasant experience. They use brain controlling shit to keep you from yelling and screaming and stuff. Best to stay away if possible, or else you'll be scarred like me.