"Actually Sam, I'm fine with a physical contest. I have a kind of weird request though."
"What is it?", Sam replies.
"I've always had a fascination with history, you know. And uh...if you're up for it, I'd like to try...jousting."
"Jousting? The competition medieval men used to decide who became female? That's certainly weird but it's a lot less weird than I was expecting. There are some cultures that still do that even today you know."
"I know but nobody does it here in the west anymore, so I though-"
"It's fine Ty. I won't say no to something that improves my chances of winning. I accept your challenge."
"Jousting" in this universe was not like the jousting you know from ours. The ancient practice of this world's humans had been to joust just like the flatworms with which they shared a reproductive system. The arms of the two men would be tied behind their backs, and they each stab at each other with their erect penises until one managed to penetrate. The winner would then inseminate the loser and become the husband. Though the practice was seen as backwards and archaic by most, some cultures around the globe swore by it, insisting that the thrill of battle and the feelings of victory/defeat would help the two newlyweds accept their roles as husband and wife.