I just mean physically. The mind is important for maintaining an erection, but so is the body. I don't know if a penis could maintain an erection when it's been injured in that way.
Plus in South Africa there is a very disturbing trend of men raping virgins in order to cure themselves of AIDS. They aren't doing it for anger.
I've heard of that. I don't know how much truth is in it, but I remember hearing that they'll go so far as to rape babies, because they believe their virginity is the cure.