It's always really entertaining to me to see a bunch of dudes moralizing over what does and doesn't constitute rape.
EDIT: Preemptively: yes, I know; men can be raped, and not just in prison. Believe me, I know this better than you even want to guess at or speculate about. That doesn't change one whit the fact that people tend to talk shit and judge the world from their own categories and preconceptions, and not others'. This (generally, not specifically; your comment was simply the one that pushed my "Okay, I need to say something about this nonsense" button hard enough to actually respond) is just one of the more egregious examples of that.
EDIT: Preemptively: yes, I know; men can be raped, and not just in prison. Believe me, I know this better than you even want to guess at or speculate about. That doesn't change one whit the fact that people tend to talk shit and judge the world from their own categories and preconceptions, and not others'. This (generally, not specifically; your comment was simply the one that pushed my "Okay, I need to say something about this nonsense" button hard enough to actually respond) is just one of the more egregious examples of that.