Such as "sleep molestation" seems to be a "go to thing" for incest themed games. I don't really like such either, its poor story telling. On the other hand, creating a sandbox game and fill it with story focused content would probably make it take a long time before any lewd content got introduced. So I suppose its a fix to introduce some faster, but bad at that. Playing a protag that just come across as a creeper, not really that interesting.
You have more vn type of games with branching content etc, that you might be lucky get the content you are interesting twice a year. There is creators and games out there such as WVM that break the mold in regard of pushing out content, but that is not the norm. Hardly any of these creators could call themselves full time devs. It's not their nine to five, go to work every day. Think a lot of people forget about that.