Help finding a tuning file

So, I've been going nuts because all the male townies my game generates have some kind of beard. Like, 99.9% of them. I'm assuming the issue is the game uses RNG to assign a beard from the facial hair category, but that means that the chance of getting a cleanly shaved sim are slim to none. So I thought I'd take a look at the files for townie generation and see if I can change the probability of the game assigning a beard to a sim, or mess with the RNG system or something, but I can't find the file related to townie genetics ANYWHERE. I've found plenty of sim templates that don't have what I'm looking for, and I've found the tuning files for outfit generation, but the categories in those do not include things like hair or beards. Does anyone know where to find what I'm looking for? I've already wasted hours on this fool's errand but it bothers me SO MUCH :cry Thanks for the help!