I agree that being frustrated over not having more in the time that development has taken is reasonable. IJS that suddenly dropping a sex scene with Jennifer or something would make the game far worse. Not only did it take a long time to get there, but you then also have a pile of hot garbage after all the waiting. Compounding the grounds for criticizing the game isn't the answer. Reviews will go from "nothing happens" to "a whole lot of nothing and then a sex scene that doesn't even make sense where it's been put".
I think what needs to happen is something major that could be foreseen based on the story so far, something that would force things to move much faster. One of the more obvious plot devices could be that Alan has a major meltdown (which is completely reasonable, given his behavior so far) where he takes it out on Jennifer. (Or, obviously, he could finally cheat on her, which she would view as far worse.)
She ends up scared and crying, and the MC himself basically kicks Alan out while citing how much of an asshole Alan has been. Another couple of in-game days where she says how stupid she's felt for never seeing it, how lonely she's been, etc. She comes to realize the MC — even if he has gone dominance with her — has been a far better man than the one she married. Then you have regular progression of lewd scenes: full-on making out but stopping; massive petting, even to climax (for her especially); oral stimulation (nipples, vagina/penis, maybe even anuses); and finally sex.
The above example would take one in-game week approximately (or just over half that if two of the progressive lewd scenes happen each day after her realization). It would still mean awhile to wait (at the dev's current pace), but it would at least stay somewhat reasonable to the story while also drastically decreasing the total wait time for players to get to see sex with her. I'm not going to pretend the dev hasn't dug himself into a pit somewhat, but it does take time to climb out of the same hole.