this is so that furries/people can make the char look almost like their fursonas

Similar to tentacles, urethral sounding, cbt, and oviposition, often but not limited to, a penis. The tentacles or whatever jam in through the urethra and you can see them distend through the urethral canal all the way through in to the ballsack as they play/squeeze/eat the testis.
This fetish often interplays with internal views of anatomy and whatnot, everything from cross-sections inside the penis, to x-ray views inside the ballsack.
Could be fun considering it's also a cross-section of a lot of fetishes.
This fetish also uses maggots or insects, which I am not a fan.

Using saline to increase size of genitals and other body parts.

You have a subject sitting in a suspended box, and their junk is peeking out through a hole in the bottom. Do whatever you want to them, and based on what you see happen to just this little bit, make guesses about their: species, kinks, sexual stats, etc. The more accurate you are, the better the reward!

and the legs/butt proportions are strange, the butts always look flat, and the legs look too skinny

Give the player manual control of the height of the rack chairs/tables/stocks instead of relaying on the IK.

A tank full of Aphrodisiac gas connected to a mask that fits the subjects. The gas constantly delivers the gas into the subject, making them extra horny

And the dialogue.

IRL, dogs have a bone inside their dicks.

A bendy penis thus looks REALLY painful to those who like anatomical accuracy.