"teen" is a ubiquitous porn category that, in practice, describes a body type, not age; similar to how "babe" almost never means "infant".
I would be more surprised to get SFW results from that prompt, considering the result would be based on more heavily regulated (less common) photographs of minors.
I got the same thing and am very confused. They are the ones generating the image. Why did they generate porn if they don't allow it? Also apparently clothed teenagers are now pornographic? I think their image analysis needs some work.
We detected that generated image contains nude content. Try changing parameters.
Not sure what to make of this, but it feels wrong, somehow?
Edit: This was the prompt it generated for me on page load: "Minerva McGonagall in Hogwarts, wearing Hogwarts robe and witch hat" - https://generated.photos/human-generator/64e650a39563e6000e0....