It's a rather specific fetish, why isn't really answerable it simply just is arousing to me. The sidebar explains what it is and the last line a shot in the dark (ba dum tsh).

I don't think it's such an alien concept given this comm did pretty well on lemmynsfw, rank climbing here too. That'll die off sharply once the re-posting is done, I just have everything from there archived. O.C. is not remotely common.

edit: also kinda adjacent to x-ray hentai.