Basically what it says on the tin. Could be fun to just set a bunch of subject going on different 'songs' and witnessing the results. Or maybe being given songs, and testing their effects on people.

Having a group of contestants all competing. Same equipment rig for each of them, same techniques... but who can take being tickled for the longest? Or balance a ball on their sternum for the longest? Winners could get some kind of prize money, which would not affect your character directly -- it's not your money -- but would make them more likely to return. You could also "cheat" to try and make this happen!

I think fek needs to implement a system where you can research a latex substance that can transform a host into a living sex drone slave that you can order around, break, toy with, use, own and sold.

Would be a very interesting game mechanic plus not alot of porn games do this

Reference:

Basically a set of machines that the player can strap themselves or others into to run an automated experiment.

Just a thought while playing Sims for some reason.  Pretty much means put a subjects balls in the players mouth and "gargle" them. Combine that with a jiggly penis and I may pass out. 😁

Being deepthroated by a long tongue is one of my favorite fetishes. 

Ungulatr is the best artist for this fetish. 

i think there should be some easter eggs and cheat codes discover-able to the players, sometimes dedicated to those who donate $100 a month on feks patreon.

put sliders for how much each of them should be... wobbley

I love the feelings subjects have for each other, and the player. If those could grow and change over time, and if they could develop more varied positive/negative feelings and earn trust/distrust, that would add a lot to the experience.

If possible, there should be a system where a higher orgasm rating makes the character ejaculate harder, or the opposite. For example, an amazing orgasm for a male could have him shooting way up in the air or over his head, absolutely drenching himself, whereas if you just tip him over the edge and ruin his orgasm, there could maybe be one or two dry twitches or throbs before his orgasm just starts leaking out, dribbling down his cock.

Same thing for females, an amazing orgasm could result in them absolutely drenching whatever's in them/in front of them with squirt, or a ruined orgasm would leave them twitching with their juices coming out with no force, just running down their thighs or ass and dripping onto the floor.