I think people marry in various cases not because of sexual attraction but for some other reason and might (if not so notably given the same sex angle) on a sexual level be attracted to others. In the past, sexual attraction often wasn't a major concern for marriage at all. Find his views on sexuality misguided but someone can have some other more troubling sexual attraction or unattainable all things considered. Few marriages are perfect anyway. The immediate reason is misguided but can't say it is clear this marriage won't work.