You could always find explicit games on Steam, but now they're available in a specific section for ease of browsing
I'll admit I've had a look at the saucy games before, mainly because I like keeping up with new titles that have gay themes and sometimes there's some overlapValve is tinkering around with how its storefront operates and compartmentalized its library for users to enjoy. Among the latest tweaks is the inclusion of an Adult-only NSFW games curator section designed to house mature titles that are not intended for younger audiences.
While a plethora of these game titles are sexual in nature, not every single title included is sex-driven, including a few that are far-reaching into drugs and other more mature themes. That being said, it's an adult section, so expect lots of hentai, tentacles, and the things that memes are made of.