Weird idea, I guess its possible.
1. A female bodybuilder or other immensely strong female could rape an average man
2. A group of females could rape a man
3. A female could use a drug to weaken the man and then throw herself onto him.
4. Anal rape with foreign objects is possible
5. A woman could have a group of friends strap a man down and then she could throw herself onto him
This is a disturbing thought!