Everyone knows male nipples are SFW, but female nipples aren’t.
This one is an edge case.
I mean this discussion is interesting but for now I just wouldn’t want my family to see this when they look at my phone so…
I see some strong social commentary here: A male presenting person essentially turns one of his (formerly SFW) nipples into a female nipple - thus turning it… NSFW? I have never seen a more scathing indictment of the bigoted way in which we treat bodies based on sex.
That, or he was being moderately funny.