Are you asking about a straight man having anal sex with a woman opposed to vaginal sex or a man having the "doggy style" position with her? Well I'll say it would be hypocritical and biased and heterosexist of a straight men to condemn a gay man for having anal sex with another man if he indeed has anal intercourse with a woman or receives anal stimulation from the woman. It's all a matter of preference, live and let live. To each their own.