Considering the whole situation with Itch and Steam, I thought I'd point out something. GOG seems pretty supportive of adult games. They're talking about how their games are DRM free and owned forever, they were pushing back against the situation, and I saw that for two days they were offering NSFW games for free, including the very popular Sapphire Safari. It could be that they're just using the situation for PR, but I see that they actually have a lot of NSFW games on their store. And I think they allow Early Access.