PRO
* Different characters with real motivations and backgrounds - each character feels genuine.
* Storyline that seems plausible, something that we can relate to, even if a little fantastic.
* Wish fulfillment - everybody wants to be wanted, desired. But let's temper it with the reality side just a bit - having 100 women who want to fuck you the minute they meet you seems boring.
* Variety of different partner types - curvy MILF, athletic teen, whatever. Too boring when it's just 5 of the same women with a different head.
CON
* Too long, too wordy. We're all just trying to get into this game to make jerking off more mentally stimulating. Let's not waste *too* much time with 10,000 words of dialog and plot before we get there.
* Ridiculous premises - "Oh you're the best assassin for the Tanaka Clan, but your father has been killed and now you must protect your mother and sister from ninjas, and also the ninjas are sex maniac teenage high school girls, and your aunt and two nieces have decided to visit, and your childhood friend is also now here."
* Repetitive actions, grind. I don't want to have to "Get Shari's 'love' score to 150 before she lets you see her nipples" when it requires you to pat her head once every morning and buy her a coffee once every afternoon to get a single point."
SEX SPECIFIC
* The male character's dick should be big enough to be impressive but not so big it's like the size of the female character's leg or something. I don't want to see a dude's dick WEARING a girl like a condom (unless that's the plot of the entire thing or something)
* If there are fetishes/kinks, be clear beforehand, and make it more than just the MC's kink. If this dude likes to tie women up and eat ass, there should be SOMEBODY there that he can high five afterwards. "Nice ass eating, bruh!"
Also, please add a gallery/replay that can be accessed at any time and fully unlocked by players with a toggle switch.