about the clubs and what not im not sure. but i have many friends who are gay and they dont seem to have any more problems than anyone else. the same rules apply to homosexuals and heterosexuals....dating is not allowed; so be careful because homosexuality, i think, is against the law in dubai. however, i wouldnt worry too much about that because there are a lot a lot a lot of gays around, so if it is against the law, it isnt enforced.
but yeah, apart from the showing of affection in public, you can basically do whatever you want.