Although 2/3 of NSFW games have this element, I'm not a fan of games where the player gets a scene with sexual content for losing. It kind of makes me want to be clumsy in the game, or makes me think that the game developer hasn't thought of any more reasons to add h-content. But this is just my subjective opinion.
That's a fair and quite common opinion, cause it is kinda counterintuitive. On top of just unlocking it in the gallery, there is the option of making it relatively consequence-free in terms of win/loss and have the player wake up somewhere
As for the games you wrote about, I was hoping to see more 3D games like the one I'm making. Still, thanks for sharing, it will be interesting to explore these projects.
Disappointingly, there aren't that many full-3d NSFW games. Seed of the Dead which I thought was pretty bad, but still a decent exmaple of what they have to offer.
My favorite so far is
Aruna and Labyrinth of Sealed Lewd - basically "armored core, with porn".
There's Bioasshard, incomplete and suffering from I dunno, an identity crisis? The actual NSFW content hasn't been expanded on in years, as far as I could tell when I last played it. Nonetheless, its gameplay mechanics are sound and it's reasonably content-dense.
There's
Project Extermination also in progress, can't comment much, long time since I played any of its demos, was pretty barebones last I checked - but still demonstrates a solid concept and good visuals.
And
Delta Zone - first/third-person quasi-extraction shooter
The thing is, all of them except Aruna seem to really de-prioritize NSFW content so far. It's there, but it's not really what the game is about.
Closest thing I can think of to your game is
Breed Lab, also not finished yet. It's also very puzzle/navigation-based and personally I find it even more tedious than this - at the same time, it is also more content-dense vs time played. In your game, the maps at least don't take too long to actually move through.