Your comments

Errr... We probably don't want anything too realistic. Imagine needing to wait half an hour for a male test subject to go again.

Uhhh. There ARE preferences. It's like, the very first thing the game briefs you on is your sexual preferences. These preferences determine what sort of test subjects show up for you, and can be customized for each character file.

As for specific custom characters? Those ALSO have preferences. All characters have specific preferences and orientations, including player made ones. These preferences affect how the subject will react to testing if they themselves are rack'd.

I wouldn't really care for it, but I will say that I think lots of people would LOVE being able to make and rack humans and near-humans. Maybe some people just want a human girl with cat ears and a tail or something.

This would also greatly market the game to non-furries as well. If the humans were developed enough, maybe even a human-only mode could be developed specifically for people who have no love for the fandom.