That’s why it is an ancient practice, whereas homosexual “marriage” is unknown until recently.
Polygamy is hardly an ancient practice. It goes on now.
Serial monogamous relationships happen in Hollywood and the local dive bar all the time. 48% of births are out of wedlock.
I’m indirectly making your point.
Recently? That part is not true. The early Roman Empire had religious ceremonies for same sex partners. Civil unions date back to China and the Zhou dynasty. I am not advocating at all just pointing out some facts.