not everyone rapes for the same reason in particular
but gender doesn't play a major role in that at all...
personally I don't really see how a femle could rape a male unless she FUCKed him in the ass with something, but other than that it's pretty much impossible cuz a guy controls when he gets a hard-on in order to have sex in the 1st place...
not saying it doesn't happen, I just don't understand how it could