Is it permissible for a gay man to marry a woman?

Is it permissible for a gay man (i.e. someone who is attracted to the same sex) to marry a woman? He might want to do so because: - Pressure from family and society to get married. - Companionship - Children - etc. Or is this unfair to the woman, because her husband isn't attracted to her sexually? Similar cases like this: - Can a lesbian woman marry a (heterosexual) man? - Can an asexual get married? Another question: Is it required for them to be honest about their sexual orientation before marriage? and if they hide it, is the marriage still valid?