but well.. if castration really gives "only" -5000% fertility, a pregnancy WILL happen. and it won't be a real bug, either, since even a 5000% lower chance of conception is a chance >0 (no matter what the initial chance was...), so it has to happen sooner or later.
uh, no. if i recall correctly, castration give shtem a -5 penalty to fertility, and celibate one. if you have a HUGE bonus to fertility, it is still possible to have a vhild as a celibate. but not with castration(or at least not in vanilla withotu cheats ect.)