I was just guessing and going off what has been posted by the creator. If you go way back in the thread you'll see that initially he intended to have separate pics with pubes, tats, various piercings etc. That was when there was a two slave limit and he figured players would be satisfied to train one girl at a time with perhaps a favorite as an assistant, like Slavemaker 3.
It turned out the players wanted more slaves at a time than that, and more slots, Slots, SLOTS! Me included. Thus the more customizable render schemes become untenable. As for imagination, I have to do that, as in my fantasy household the pretty girls are all naked--all the time. I may decorate them with piercings and their collar and cuffs, but that's all in the house--ever. So I don't like that some of the renders have clothes, but imagine those clothes away. Not ideal, but it works for me.
Averil Lewis has unshaven pics, have you tried her yet? She's one of the best girls overall, a popular choice for wife too.