Lots of people say lots of things.....noting is absolute, except that homosexuality is abnormal, and a minor mental disorder that usually harms no one.........
We don't make hundreds of different regulations to cover every possible scenario that MIGHT or might not occur.......
That law as it stands has served us for hundreds of years and there is no need to change it......no one HAS TO GET MARRIED in order to live their lives to fulfillment.....
Couples (men and women) DON'T need to marry to have sex or have children, and many don't.....
It is available for those, usually the women, to protect themselves and their children......
Adoption doesn't require marriage.....a single man or women can adopt a child, there is not law that prevents it as far as I know...(I could be mistaken)