Like, which will be successful? Like, for the breeding game?
It checks whether a character got knocked on immediately on each insemination. So you may as well ignore the multiple partners part, who ever pops inside first wins. At least, like, most of the time. Unless you've increased fertility or virility at all, in which case it's all the time.
There's no delay or anything on the check, so the odds of the second partner mattering at all are pretty low.
So for the breeding game, whoever goes first is the winner. I automated that game once and ran it 10000 times to see if it would be a useful way to make a ton of money, and someone other than the first person won like twice. And you can absolutely use this method to make a ton of money, but you'll also break your save before you finish getting through all 10000 matches lol