I don't know if i'm unlucky, but i've been playing the game admittedly after altering my character and going around and fucking and being fucked by everything in sight because i have the curiosity for it. That aside, i noticed as time went on it because really hard to find horny weresluts or centaurs around the map, even after reaching the outpost i'd be lucky to find them around, and after that once i beat their tile it was close to rare that i'd ever see ether of them again, just replaced with food drops, womps, bandits and gobos.
I just wanna suggest just a tile for that stays persistant for the centaurs, like the strange merchant for the newer builds on patreon, where ya could try and get their ending there or trying to best them in battle (or get bested.. a lot).