While gathering examples of Michael Reh’s male photography, I came across several sites that referred to genital nudity as present or absent in various photographer’s work (so far as I can tell, there’s none in Reh’s, though he cuts the line very close). In genital nudity, the Adj genital is nonpredicating (His nudity was genital is anomalous): genital nudity isn’t nudity that has the property of being genital, but instead it’s nudity of the genitals, that is, exposure of the genitals. The Adj genital is interpreted via the N genitals — interpretation by evoking a noun is one mark of the type of nonpredicating adjectives known as pseudo-adjectives. (Resistance to modification by degree elements — note the oddity of very genital nudity — is another.)
Putting this aside, there’s the question of how to refer to the images that are banned in certain contexts (U.S. postcards, WordPress postings, etc.). Here’s I’ll restrict myself to the male body in these contexts.