Ok listen, I didn't mean gender identities in the sense of socially defined gender norms, perhaps the connotation of 'gender indentity' is too strong.
How about general perception? The general perception is that women, at least historically, have been less able to defend themselves against unwanted advances, and it is from this that the moral abhorrence of rape towards women is held higher than that of men.
Again I am in no way saying that it is worse, I'm just trying to provide an explanation for the underlying sentiment.
The fact that internet perversions exist doesn't really affect what I said.