Before posting you must verify that you're human by sending a nude.
First, allow the tab to use your camera if you're using a browser or allow the mobile app to take pictures if you're on a mobile phone. Pose and snap. A trained neural network will check that the photo is NSFW otherwise you shall not pass. Reverse image search will guarantee that the photo is original. The user could also be asked to display a timestamp with a random silly sentence, for good measure.
This beats every other human verification system because spam bots can't send dick pics or boob pics as they don't have those.