Why think about it and draw conclusions from there? That's not how science works. Why should something like sexual proclivities be treated any different? Do we think about how there must be a couple od basic elements and fire is one of them and it's inside the candle and that's how it all works? I mean, just think about it for more than five seconds! How else could a candle work unless the fire is already inside it!

Anyway, here's an actual study about sociosexuality that followed 288 men and those that got married and had kids showed a decrease in casual sex vs men who didn't.

https://digitalcommons.unl.edu/famconfacpub/267/