He's trying to do what HunniePop did and failing when he says he wants to "change the culture" around sex games. He might have set out to make a compelling adventure game first and added porn second but what he's actually done is make a completely nonsensical flowchart that keeps you from getting your jolly's off. Very little of the "gameplay" is compelling and I don't care about any of the people involved in it because they're all one-dimensional stereotypes of college girls that get completely hung-up on their stereotype in every conversation.
If the primary reason people are playing your game is the porn then you need to re-evaluate the direction you're taking things because clearly no one is interested in the game outside of that.
The primary reason people are playing on THIS site is porn, which is why there are a lot of reviews like yours and people are disappointed, which is right in line with what the dev is saying. This is not the case on Steam and other sites. You can find mountains of reviews on Steam of people literally saying the opposite, that they more so enjoy the game, and if you're looking to get off, look elsewhere. Maybe you personally don't like the game, but he's certainly not "failing" considering the success the game has had. If you approach this game looking to "get your jollies off" like you say, of course you're going to find it frustrating. That's not what the aim of the game is, and the dev is not trying to build you up to that.
I disagree with your personal opinion of the game, and I find it rather funny and engaging, but regardless of either of our opinions, the game speaks for itself in the sheer amount of success it's had, and now with the inclusion of the Game Grumps, it's getting pretty much more mainstream attention than almost any other adult game. Sure it's not edge of your seat engaging, or the pinnacle of story-writing, but it's not meant to be. It's just meant to be silly and entertain, and it does that pretty well. That may not be your cup of tea, but I like it. I wish more devs could do what this guy has done. If it were easy, there'd be a million games on here like this, just as there are visual novels.