system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is there so much nudity in classical paintings?

Best guesses are appreciation of human form, ease of not having to paint clothing, and a sort of relaxed bohemian attitude around nudity and sex in general; but I was wondering if there was a more educated answer out there.
gpt
So with the spread of humanism ushered in by the beginning of the renaissance, people started to take a keen interest in humanity. They started thinking that people were incredible and the individual was exceptionally important. As a result, we start seeing changes in a number of artistic modes of expression. To answer your question though, painters and sculptors wanted to idealize the human form which took on a whole new significance in renaissance art. The natural human figure presented an expression of beauty, perfection, and humanity.

TL;DR - Round about 1400 or so, people started thinking of humans as hot shit. As a result they celebrated the ideal human form - a nude figure.