Well, that's silly; of course there are similarities. Gay men are attracted to men like women are, they find masculine men more attractive, like women do, and moreover, gay men are often feminine like women are. Gay men have more sex than women do, in general, but that could be socio-cultural, or it could be that they have a male-typical libido. They are also more visually oriented than women, like men are; gay men like porn more than women do, and aren't into erotic novels like women are. But that doesn't mean there aren't ways we can compare gay men with women. Finally we can get into the neuroscience and point out that gay men do indeed have brains that have some features that are like straight women's.