You come to a pron site and ask "why does every game have to be a pron game where you virtually screw a bunch of good looking pixels". *Facepalm* Also so far at least it isn't even on the level of Point of no Return or Personal Assistant.Well, I agree if the game is meant to be MK. But it works in the opposite direction too, why does every game have to be MK? As if there are no other plots exist. If sex with every female character is VN's only selling point, I feel like it's badly written VN.
And also, not every game here IS MK. Like I said there is always Melody (I dunno any others, maybe Sunshine Love). The closest you get to "dark" in there is when she has to choose between her career and relationship.