Indeed, I worked in a photo lab back in the day when NSFW images were still on film and we had to think about these kinds of rules, but basically anything was permitted for medical purposes - I once scanned slides for a doctor doing a lecture on pelvic inflammatory disease. She did not say what they were when dropping them off and amusedly asked about it when she picked them up. But it was the very opposite of sexy and quite clearly for genuine medical purposes.

This reminds me of a question I've long had about this sort of thing you reminded me of - in the US at least, we seem to draw the line for showing off breasts at the nipple, but only female nipples. Setting aside any merit or logic to that, can AI actually determine female vs male nipples? I assume not through the nipple itself, but the breast it's attached to or the face of the person?