1. there's a setting for this called "accelerated pawn auto-leveling" in the main menu's options.
2. I'm not totally sure, but, off the top of my head, there's: Dr. Quinn, Tavi, Alex, Socket, Kidlat, Rahi, Vion, the fight club, and Mirri / the blacktail market, at least.
3. You can clean the PC inside when you shower. You first interact with the shower, which cleans outside, and then you are given the option to leave, masturbate, or clean inside as well. For slaves, I imagine you just leash them and take them to the shower to be washed in the same way.