tI realize no one wants their jerk off games to be too complicated since it gets in the way of the jerking but I think a decent way to add more nuance to the sex is that the girls can have preferences to what action you do next instead of just going down the list in order each time to get as many actions as possible for the grade. Have them signal or hint at what they want you to do next. You can expand on the threshold where they become "horny" where they want different actions based on their level of arousal and each girl can be different and unique in how to get them off. Put in a system to figure out their likes and dislikes in that regard. Right now the sex with each girl just all feels the same and is very repetitive. Once you've unlocked sex they end up coming before you even get close to the sex section of the menus currently. Then it's just repeat whatever your kink is to make your character cum all his cums.
This! many devs dont signal this. thats why i mostly play moded games. I get you want people to replay the game but those games that come with a build in walkthrough mod are the best. I know this is no RLE but you have no idea how many times ive click on a dialogue and went back to see how many point it would give. Especially the first time you meet a girl to get the more points. Prime added this feature to the massage mini game.