I totally get what you mean. I’m not a particularly prudish person either, and I don’t have any issue with adult content in games as another form of creative expression, but I was also surprised by how many games of that type there are on itch. The sheer volume really stands out, especially when you’re browsing through new or popular releases.
I also find myself wondering why they’re so successful on this platform. Maybe it’s because itch.io gives creators a lot of freedom, or because there’s a big audience looking for niche interactive experiences that aren’t allowed elsewhere. Whatever the reason, it’s definitely an interesting phenomenon.