Nipples seems a pretty silly thing to start focusing on when he clearly said they weren't interested in adult content.
EDIT: Generally I'd say in Europe while women's breasts are sexualised, they're not considered sexually explicit. The US is exceptionally prudish in comparison and for well-known historical reasons, too.
If you re-read my comment you’ll see that my point of starting with nipples is precisely because they aren’t the adult content that Automattic is understandably interested in avoiding. Why are your nipples nbd while mine are adult content? That seems “pretty silly” if you ask me.