Easy, no one seems to care about nude men so all you need is an indication of the range of women's skin shown

* Face showing - banned in middle Eastern Muslim countries * Bellies showing - banned in south east Asian Muslim countries * Ankle showing - banned in India * Shoulders showing - banned in catholic countries * ... * Nipples showing - banned in US * Genitals showing - banned in Japan * Personal name mentioned without a personal data release form - banned in Germany * (End of list)

If necessary can be supplemented by a range of the commonly accepted levels of male nudity * Any skin showing - banned in Vatican * Penis showing - banned in US * (End of list)

So we have a binary numerical code, or a ternary if you add also practices (ranging probably from female eye contact with the camera and male-female touching over male-male intimacy up to bestiality).

(Hope clear that this is sarcasm.. do not build the torment nexus!)