Can't imagine this happening for Joe Bloggs, rapist, can you?
Sadly, I can imagine it, yes.
However, I can't imagine a (gay) man tripping and falling and his erect penis landing in a (straight) man's arse, getting away with it.
Because for some reason it's only women whose rapists have their crime mitigated by the fact they were drinking/dressed provocatively/secretly wanted it. If a man is raped, it never is suggested to be his own fault.