This should be less about the definition of rape, and more about the fact that men (like women) can have sex forced upon them against their will.
Whether you call it rape or not is irrelevant at that point; it still happens, it's still horrific, and it still needs to be recognised as illegal.
Whether you call it rape or not is irrelevant at that point; it still happens, it's still horrific, and it still needs to be recognised as illegal.