Thing is most people run everything through a subconscious "How does this affect my food supply?" filter. Someone in 1950s America might be mortified if a nude photo of them was passed around the office, whereas someone from some remote tribe somewhere would have no issue with everyone in their world having seen them naked. Why is one mortified and one not? Because to be exposed in the first instance is to be socially looked down upon, and our brands are hard-wired to interpret being socially looked down upon as a risk of diminished food supply (red alert). Other words, all comes down to food.