What a moron. One might as well ask how you know Anna Kournikova is hot if you haven't stalked her.
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.