There have been many who tried and none of them ever actually reported back on their efforts, even years later. Presumably its too hard to do or no one has the time.
Closest you'll get is stuff like Accidental Woman, which is more focused on coding mechanics just for the sake of having them than focused on the game design or the porn.
Lilith's Throne, which has a variety of issues of its own and is similarly spaghetti-code and slow dev time. (LT's dev keeps setting deadlines and always misses them, then spends days apologizing instead of working on getting it done. I wish they'd just drop the deadlines thing since it just seems to stress them out and make the update take longer than it would otherwise.)
Or the various Era Games, which have been around since the 2000s and have hundreds of people from all over the world working on them. All coded in EraBasic, which is an anachronistic behemoth of antique spaghetti-code that's been grafted onto each other, forked apart, modified, and re-tooled many times over the last two decades. Even with so many people working on the Era Games, their development can go at a snails' pace at times as well.
Finally you have Degrees of Lewdity. Which is the only exception to the various problems the others have, though its fetish content is far more niche. (Almost exclusively focused on Loli, Shota, Furry, Bestiality, and Non-Con.) Honestly, not exactly that surprising that DoL is the one with the least development woes, the most content, and the best design. The Lolicons and Furries tend to be much better coders/planners than the other fetish communities.
There's only one other game like this I know of and its been in development for years with no demo. (Dev doesn't wanna release it until its legit done. 1.0 versioning and all.) Most similar to Lilith's Throne. It keeps changing its name and I can't remember what title it goes by now.