She may be letting folks do that, but she's only doing that, SmokinD, because something's very wrong with her. Girls aren't built to do that, emotionally or physically. Train-runners are likely either drunk or have been damaged by previous horrible things that cause them not to have any self-esteem or ability to discriminate between healthy and unhealthy intimacy. Some guys can justify it in their minds, obviously, and I'm sure there are girls in the world who behave as if they're having great fun at that activity. Talk to someone at your nearest university's rape crisis center and find out what that sort of sexual activity means on an emotional level to the women who participate in it. It's not good.