But at one point, if they were not in a previous same-sex relationship, they could. Or have in the past...and infertile couples have the plumbing and presently, science, to procreate with the girl bits and the boy bits.
Same-sexers don’t have the proper plumbing period...
If you’re using the procreation argument....
And we as a society are far beyond the concept that marriage is a necessity for procreation as almost 50% of the children born today are born out of wedlock.
Argue the case on the First Amendment’s Freedom of Religion as it inhibits people’s right to practice their religion if gays are allowed to marry.
And, argue it on States’ Rights.