Because the sex is not intrinsically evil if you were born gay.  Moses did write Leviticus, Levites in Babylon did for cultural reasons.  The Mosaic party, if it existed at all (and they found evidence at Horeb, not Sinai, was small.  They found where in Egypt the Israelites came from.  A village, not a large area.  How can they permit gay marriage for employees and sacramentally? It would be an act of humility to do so after we were so sure that they were contemptible (and atonement for our hatred - and don't dress it up as some kind of concern for their salvation) and to assist their salvation by directing them to monogamy rather than serial partnership.