Ya see, you need men and women to socially make babies, and society is made up of men and women.
Therefore, children are entitled to guaranteed dimorphic expertise when assimilating into society. Otherwise, we're violating their freedom of assembly.
Duh.
Oh, I don't care if homosexuals are naturally oriented or whatever. This has nothing to do with that.
Marriage is for the children. Otherwise, we're offending all the non-married couples who are in loooovvvveee.