Aren't there mud wrestling matches between two or more women scantily clad in bars? Why is that not considered gross and nasty? Oh. Wait. I know. Because it is girl on girl. Which turns most guys on. So...that is ok. But if a family decides to play in mud..they are rednecks. Gotcha. Um hm. Not.
Lots of men love girl on girl stuff: girls kissing, girls wrestling, girl on girl porno. They consider it a turn on, not disgusting and repulsive. But when it comes to gay men, they are repulsed. It has nothing to do with their moral beliefs regarding homosexuality; it has to do with their personal fear of male homosexuality, their own lingering fear of being inadequate as men, their own male identity.
Where would we be without a little psycho-babble repeating stupd cliches about 'male fears'? It is, after all, quite possible that people find some things disgusting because evolution has wired their brains that way.