it is posible.. anal stimulation can cause it in some instences.. I had the same question because I seen a gay porn once and I wondered why the guy recieving wasent hard.. lol dont ask.. no I dont watch gay porn.. and no it doesnt turn me on.. lol I just ran across it once.. and watched in discus..
No. But they can ejaculate without being completely erect AND men can have an orgasm without erection or ejaculation.
It's possible