Tradition moving in to the non-traditional?

Have the ideals for leadership of heterosexual relationships that are based upon long-lasting tradition of religious belief transferred onto homosexual relationships as they became more socially acceptable?
At least you can't deny the focus upon it being a 2-person relationship and faithfulness and no adultery has increased since it became a topic in public dialogue.
Practicing polyamory or a policy of "to each his own needs" gets a similar strange look as among man-woman spheres, as long as someone is not involved further into subcultural scenes which are open to these kind of lifestyles.