The first Fallout barely had anything, but Fallout 2 sure is something else having specific perks, traits and statistics about sex, a bunch of people you can have sex with and some you can get pregnant, and you can work as a prostitute or a porn actor. Or force some of your companions to do so.
Also something everyone else learned is not a good idea as perfidy results in the enemy assuming you are doing it and executing anyone wounded or actually trying to surrender. But Russia seems to have missed most of the memos documenting what actually did and didn’t work during WW2 - like if you actually want someone to surrender, try not to rape, torture and kill all their civilians and soldiers, as that tends to make the rest of them angry.