There seems to be a bug that was reintroduced with the latest free release. Encountering a centaur camp has a test which can result in the player spending willpower to resist the centaurs. However, the willpower will be deducted even if the player decides to go to the camp orgy anyway.
Agreeing to go to the camp also still changes the class name to mare and triggers the fight loss orgy scene, but has none of the other effects that losing the battle does.