None of my slaves are getting pregnant, I'm not sure if it's a bug or I'm just unlucky.
Save before any sex scenes and then try with each slave, use mind reading on each to see if they have become pregnant. Also check and make sure your main character and slaves don't have contraceptives selected.
Fastest way to go through the scene is to just select a vaginal penetration position and repeatedly select it until it ends
I also noticed that my starting slave gets stressed whenever she has sex, is that a bug, or part of the mod/base game?Fair point. I'll work on adding in a toggle-able option for the stress Attraction options during sex for a future version.
Stress can occur in the vanilla game during sex and I won't mess with that, but incestuous actions, forcing them to have sex with people they aren't attracted to, or penetration after tearing can cause stress.