A room where possible test subjects are waiting.

Maybe with some time constrained mini game.

While you are doing research or tending to a test subject, the comm system announces:

"Dr. Fek (or insert players name here) please come to the reception area. Dr. Fek please come to the reception area." And you have one minute left to get dressed and fetch the WELL paying customer. If you come to late, the customer is gone, and the bonus money is lost.

cus sometimes you just REALLY like the character that you made, y'know?

Erection of the character's penis (or swelling of the vagina) while he/she masturbates experimental customers, or in any other way to satisfy them.

the Player Characters can be dominated by a subject for a "test".

I'll add a image later lol

Always been a fan of Heterochromia. It could be linked to the "Unusual fur colors etc." thing for the test subjects.

horizontal rectangular pupils - goats and other bovidae animals

vertical slit pupils - cats/reptiles

a sound is a medical device that is inserted into the urethra to expand its diameter they are usually metallic rods