But usually the protagonist wears default clothes, which are subtly color-shifted depending on which girl he's out on a date with. No one noticed that in the last seven years
The NTR is silo'd into its own game, My Futa Valentine
There's some poly Futa/Futa/Male on the Demetria / Claudia route, but I don't actually know whether that'd twig your MMF dispreference. Easily avoided, regardless
I don't actually know whether you can meet up with Sara in the MREA and get your INT reduced on Easy mode—so I suspect there's no way to get Dr. Fatima content on Casual difficulty.
You're playing on the highest difficulty, in which condoms help "a little".
It's there for game balance reasons, because sweaty futa is otherwise a costlessly repeatable source of stat gains, and we didn't want her to cheese the game