After the first sex session, the characters libido and sex organs (breasts, penis and balls) increase in size. 

You should add the option for an enema in vagina or ass then be able to plug it.

The subjects can be stuck in to the wall with different types. Player could either choose to see the subjects' faces directly, or through the monitor.

http://www.youhate.us/index.php?page=post&s=view&id=3422627

http://www.youhate.us/index.php?page=post&s=view&id=3431272

http://www.youhate.us/index.php?page=post&s=view&id=3324019

The player might be able to collect funding through these subjects by turning them into a vending machine. (The subject will receive 60~70% of the fundings)

http://www.youhate.us/index.php?page=post&s=view&id=1311671

What it says on the tin. Just be able to aim a showerhead at the nethers of a subject for some messy / squirmy fun.

A local sex casino will occasionally be unable to collect payment for perverted bets. Whatever it was, film it happening at your facility and clear their tab. Could be as simple as 'being made to orgasm while your friends watch.'

Right now I think they're stuck at however hard they are when you leave the lab room.

Currently, female genitalia have a range slider for labia puffiness characteristics, and they twitch very visibly during orgasm. Why not extend this to the backdoor: Make the tailhole spasm during climax the same way, and add a range slider to the character customizer, where left/right is width and up/down is puffiness. For example, bottom-left would result in the current "small-innie" appearance, top-right would result in a "large outie". Likely not too large, something along the lines of an equine's donut, enough to look down and see it puckering out around a penetrator. While we're at it, why not make balls twitch during climax too?

The ability to insert penis/finger into nipple.

Cumming while inserted causes breast to inflate.

Super simple.

Alternatively a toy could be added to milk cum from a subject, then inject it into another's breast/ass/vagina, and inflate that way.

some gagging visuals that can be shown with the eyes/body surging, maybe some sound effects or text.

Throat bulging if the dick is big enough 

I was disappointed at first when I saw the like for impregnation, but it wasn`t exactly coded in yet. The gene splitting would be a great idea, and you should be able to create a chemical to allow you not to get pregnant (or some kind of setting) or someone else pregnant, or you should make condom, and there should be a (optional) setting where you can add a chance where the condom doesn`t work, and you have a chance of impregnation. If there ends up being separate days, as in you can sleep, then wake up the next day, throughout the days, your belly should get bigger (If there ends up being an abortion thing, then that won`t happen.) or unless you have some kind of chemical that instantly makes it go out. If you impregnate another person, I say it shouldn`t be reported that they`re pregnant until 2 days after, or three, and a pop up will appear where it shows that "(Insert Name Here) Is pregnant!" From there, you will have a new menu, called the family tree. There you can see the people you impregnated, and the children they had, and those children`s children. (Kinda like the Sims) You can call them in anytime as a subject, and see them yourself (And have incest, if you want). After about 3-6 days, the new child is born, and another menu will pop up, like "Your child was born!" And you will be able to name them. Again, kind of like the Sims, except in the Rack 2 style. Now, you cannot rape the child, and you have to wait a couple days for them to grow up to be able to make them a subject. If you want that family tree to grow larger, you have to impregnate the child, or have the child impregnate someone. Maybe a sperm collector? And send it to another subject? Or the child? There, they can be impregnated and have children, and the cycle repeats.