It's a porn game, but by delaying actual sex with Ann and Lisa, DS himself is putting a lot on emphasis on the importance of those acts. Whether he intends to or not, he's setting them up to be the logical end of the story. There's an awful lot of tension being built up for the moments actual vaginal sex happens with Lisa or Ann, and once that tension is released, it's just going to feel natural to people that that was the end of the story. Maybe it isn't intended to be. I'm pretty sure it won't be. But there's so much frustration being attached to not being able to have sex with those two yet. It's being used to keep people to stay around, versus actually have good writing where we've already done something with them. The way things are, that hopefully glorious moment when Max penetrates Lisa for all of four or five renders or so is going the defining moment of the game to many. Having sex with a family member a second time isn't nearly as good as that first. DS would have to get creative to make it interesting after that. Yes, I just said "DS would have to get creative", so you can see how screwed that idea is.
Personally, I know I'm likely to lose even more interest once the sex with them actually happens, unless it's handled very well, and there's other stuff going on to keep me distracted. Maybe Lisa goes first. Then I'm hanging around for Ann until I can have sex with her. Maybe during that Time Lisa gets pregnant, making an interesting and kinky storyline that makes us miss sex with Ann less. Or another family member shows up. Kira's daughter, or Max's half-sisters from his father's side they didn't know about. Whoever. But this game needs more incest.
