Why does she get very aggressive during sex and some don't?

[ljg]

she's like trying to rip my skin off. first couple times she scratched my whole back and was trying to gouge off my muscles in the back and my arms, then last time i held her hands down and all sudden she bit my chest then while later she bit my neck real hard. tell the truth it kinda felt good at that time but after it hurts wicked bad. what surprised me was that this girl is a very quiet on, can barely hear when she talk and i haven't even heard her swear, btu in bed she talks dirty a lot and just goes crazy. and she is a very preppy kinda girl not what turns her on so bad