What legislation was in place to prevent hetero couples from doing the same thing?
None that I know of, but it would not be out of the realm of possibility.......
I will assume you are simply naive rather than assuming you argue for homosexual sex premised couplings benefits.
Marriage has been recognized by society and granted reward respect and privilege because of one thing -CHILDREN!
Nothing to do with love, companionship, sharing house chores, poetry, yadda yadda.
Society has never IMPOSED child bearing nor demanded proof of ability or intent. Any exceptions to the rule are for the most part ignored because they would be near impossible to glean and as such enforce.
FACT: Homosexual sex procreation is not an exception; it is an impossibility.
(WHY DO I FEEL I ARGUE WITH LEFTISTS ON FR, IS THE COUNTRY THAT FAR GONE?(