In response to the topic, there is definitely a fine line in what is classified as art and what is pornography. Personally I find being nude in front of others who are fully clothed to be very confronting. But if no one is wearing anything then there's no problem.
Of course you have to be aware of participating in nude art that somewhere someone will have that picture or painting. So be careful when asked to flash on Omegle or something because Print screen is not art.
The marked spots in there just made my day hehehe.