Comment 1 by gos

But explain to me again how "acknowledging an underlying biological complementarity" (the only part of this list that clearly applies to heterosexual marriage more than homosexual) benefits society...

I think this Op quote is theist obfuscational verbosity in full flow!

http://www.thefreedictionary.com/complementarity
Noun 1. complementarity - a relation between two opposite states or principles that together exhaust the possibilities
ungradable opposition - an opposition that has no intermediate grade; either one or the other
2. complementarity - the interrelation of reciprocity whereby one thing supplements or depends on the other; "the complementarity of the sexes"
reciprocality, reciprocity - a relation of mutual dependence or action or influence

complementarity
The concept that the underlying properties of entities (especially subatomic particles) may manifest themselves in contradictory forms at different times, depending on the conditions of observation; thus, any physical model of an entity exclusively in terms of one form or the other will be necessarily incomplete.

It would seem that this is the very definition of theist dissonant "reasoning"!

@Op .. .. .. .. which includes, for many, the possibility of procreation

... .. a lame claim dressed up in exuberant verbosity, that marriages without procreation are somehow invalid, but that this, for unexplained reasons, only applies to same-sex marriages.