Thank you Supreme Court...

Might as well be a reflection of exogamic traditions, though.

Well that's where it gets tricky, did he really marry outside of his community or did he marry his twin, or did he perhaps marry one or both of the Abel triplets to avoid the twincest?
If he married outside his community to one of the mortal women who inhabited the earth before the creation of Adam and Eve was he adopting their non religious societal culture and their accepted norms?
Were Michael and Gabriel really best men at the wedding? Or if they had been among those angels shagging the humans before the creation of Adam and Eve were they there as father of the bride or brides?