Can a man be raped?

One thing I’ve heard over and over again in the case of a female teacher raping a you student is the excuse that “Guys can’t be raped” or “If he didn’t want it he wouldn’t have been hard down there.” But that doesn’t sit well with me.

On the one hand, I do think it’s fair to say that a LOT of teen boys would love to get laid by a teacher at school, (But that’s a whole other issue entirely) but I also thing it’s stupid to say that men cannot be raped, it just doesn’t sit well with me.

Edit: I should have clarified that I do believe that men can be raped. I ask because my father says that although men can be sexually assaulted and or abused, he doesn’t think that men can be raped by women.