Now....there's a revelation.
Some will decide to accomplish that with anything. Others will accomplish that according to natural order.
Until you act out a behavior, you simply haven't yet chosen the unnatural route. Whether men with men, men with animals, men with rubber dolls -- the question is whether their sense of control will permit release with anything they can get their hands on.
Some people can't even begin to accomplish that "according to the natural order." If a man can't get an erection for a woman then the whole thing is a no-go. Other people can't do it any other way.