First and foremost, it’s the porn. I’m 40 and I’ve been watching porn since I was 12 or 13, so watching some rando fucking is boring as hell. But porn games are sensual. Something that I do really enjoy is the rhythm between sex scenes and story parts. To be honest, I don’t enjoy most stories: all the magical stuff draws a long sigh from me; the same goes for the “from saint to slut” stuff or the “harem building (and they’re all fine with it)” stories. But when I get a porn scene with a character that I like, I get excited, and then, the tension drops and I move forward in the story, waiting for the next sex scene, getting more and more excited… It doesn’t feel like brainlessly beating my meat; even when the story isn’t great, it feels more like an experience or something…
A great part of this “experience” is input from the player. By having a choice, any choice, I’m an active part of the story or scene; it’s way more immersive than porn, and really helps the suspension of disbelief.
The last thing I really enjoy is that it isn’t real and nobody gets hurt. Everybody knows that the porn industry is pretty sick: people are lied to, used, blackmailed, drugged, raped… but even if I whip my cat-girl to the bone, nothing happens in real-life (except I have to dismantle my keyboard to wash it AGAIN).