You find yourself in a room with people. Everyone else is someone you have had sex with in your life.

I'm pretty sure it's a reference to this:

https://mander.xyz/pictrs/image/429c0010-e6f2-42fe-a03e-6f66457c0db5.jpeg

@souperk

I wasn't able to find a definitive answer, but after skimming Wikipedia I think a reasonable range would be at least 3 but probably less than 17.

https://en.m.wikipedia.org/wiki/Bird_intelligence

Anecdotal evidence from the 1960s has suggested that crows can count up to 3. It has been shown that parrots can count up to 17.

It's a reference to this Article: https://mymodernmet.com/crows-understand-zero/