Yes!! a man can be Raped. The ‘he had an erection’ is not an excuse. This has been a little harder for people to understand; including men. However, erections can be both voluntary and involuntary.
Men have described involuntary erections as a sort of wave of adrenaline that rushes through their bodies which they cannot control. While voluntary erections are often the effects of a man seeing an attractive person and being turned on by them. Involuntary erections vary in cause and require little-to-no-physical stimulation. If you’re a woman who is reading this and still cannot understand how this works, think of it this way: those times when you feel that wave of tickles that rush through your body that render you ‘stimulated’ in the middle of the day, as you sit in the car in the traffic jam, working on paperwork in the cubicle, walking down the street to run some errands or get lunch – it’s pretty much like that. Involuntary stimulation does not mean that you’re consenting to sex; it’s just your body doing their own thing at an inconvenient time.