Warning: This article is NSFW.
How we have kept “mature” sexual material out of the hands of others has evolved over time, along with our morals and culture around sex. Erotic images that were once common in Pompeii were later locked in the Secret Museum in Naples for nearly 200 years, only accessible to “people of mature age and respected morals.” In Ancient Greece, women weren’t allowed to view the Olympics, because all of the sports were done in the nude.