And yet, people are still scorned and offended as if they were.
I think you are missing the plot here... If a naked pic of yourself, your mother, your wife, your daughter is circulating around the campus, work or just online... Are you really going to be like "lol my nipples are lighter and they don't know" ??
You may not get that job, promotion, entry into program, etc. The harm done by naked pics in public would just as real weather the representation is accurate or not ... And that's not even starting to talk about the violation of privacy and overall creepiness of whatever people will do with that pic of your daughter out there