Somewhere in cyberspace, I came across the two final panels of a story in which Superman prattles on insanely about why cousins can't marry; is that from "The Maid of Might"?
No, that is from a completely different comic!
Supergirl tries to find Superman a perfect wife and keeps failing, ultimately Superman proclaims that in truth only Supergirl could make a perfect wife for him, but he doesn't want to break human laws or something.
Super-Kink - another one of Superman's powers!
I believe that might be this story:
https://www.supermanthroughtheages.com/wiki/index.php/Luma_Lynai