One of the issues exercising naturists seems to be body modifications, specifically shaving, tattoos and piercings. Some private clubs have strict rules, especially against genital piercings and other genital ornaments. A true natural state would presumably include, for men at least, long hair and a full beard, and maybe these are more common among naturists than elsewhere, but no-one suggests that facial shaving and cutting of head hair is unnatural. Modification to the genital region is supposedly dubious in that it is drawing attention to that region, though facial shaving is not deemed to be drawing attention to the face.
From my observations in 2007, pubic shaving is common, almost the norm, small tattoos are almost unnoticed, but genital metalwork can still start an argument. Which luckily fits my view exactly.