I'm chuckling at all the gay stereotypes in this thread.

I think if gay people were all as obvious (wearing women's clothes, make up and perfume etc) then there would be no need to ask the question in the first place.

The only gay stereotype that holds true in 100% of cases is that gays bed guys.

But - although all gays are men that sleep with men, not all men that sleep with men are gay. They could be bi, curious, or just really drunk.