Indeed, if anything it's less of a religious pact and more of a legal thing. Just look at the hubbub over gay and lesbian marriage; you think the government gives a rat's ass about two men living romantically with each other? They won't break down their doors and send them to morality jail, but they won't give them their tax breaks and other benefits either.
"Nagi, how do you feel about being 'normal'? Normal means that if you leave something alone, it just remains that way forever. So if you can't stand that, then you have to be "not normal" in some area... - Seiichi Kirima's dying words