I think Inedible is right on the money. Speaking for myself, if a man is "effeminate" or a woman shows masculine traits, I will probably assume they're gay, but I don't take a hard stance without actually finding out. Lots of gays don't fit the stereotype, so you can never be sure. I don't think I recognize a person's sexuality by what they own or are into (Broadway, Judy Garland, and Barbra Streisand are often loved by gays, but I don't automatically think someone's gay because they're into this stuff).

I don't care if someone's gay unless I want to have sex with them.