I think it's because a lot of society view a man who likes a man to be "submissive" - of course this is totally untrue and an uneducated stereotype. Society views females as submissive and as the "inferior" sex therefore it is more frowned upon by society for a male to be gay. Also a lot of men are scared of homosexual men as they have to experience what women have to go through nearly everyday - the fear of being hit on/dominated. They get it into their heads that gay men will lust for every man they see. Society is just extremely prejudiced at present, I believe it will get somewhat better in the future though.