In a temple, or a church, but it is not your church, that's the first difference. Marriages are a legal binding of one person to another person, weddings are the ceremony, and they don't all occur in a church, some in a park, some in a synagogue , on a boat , a mosque ,or a reception hall, some don't even have priests.
Second, games do not have to worry about the legal aspects as they are not binding and between avatars, providing only the ceremony. A Las Vegas drive in chapel is more binding.
The third is that judging on the genders of the avatars or the players will cause cross players to be screwed out of content all because of a "Complicated issue.". An issue that, mind you, was no issue at all in screenshot and cutscenes during 1.0.
Put it this way, SE has no problem with miqotes being bisexual or talking suggestive behavior with. women, but a dedicated loving relationship is off the table and "complicated"? That's a sorry excuse.
