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Adult content (such as porn) is allowed on as long as its legal. You should probably mark it as NSFW though. (This is done via the edit game page under "Metadata.")

If you're planning on charging money for it, things get a bit more complicated as some payment providers are less-than-welcoming of earning money from such content. While allows you to put this kind of stuff up no questions asked (assuming it's legal) you should probably check the terms and conditions of whatever payment provider you intend to use if you intend on profiting from this.

More info can be found on the Creater FAQ here.