For a long-term historical perspective, search-engine <archaeological porn>.
I can't post a direct link, and be warned, most images would not be safe for work (NSFW).
From the search-engine hits:
"As with any archaeological find it may well have had a ritual meaning, but it is also possible that our ancestors were like us and simply preferred their porn 3D. 9 Pompeii Brothel Pictures. Pompeii was a cosmopolitan port."
You might also try <nose art.>, although much of that somehow morphed into the "publically acceptable" category.
No social stricture is permanent. Not too long go, referring to ladies' legs was
outré and they were referred to as "limbs" in polite society.
In days of old, a glimpse of stocking was looked on as something shocking, now Heaven knows.... anything goes.
Terry,230RN
REF:
https://www.lyrics.com/track/6710771/Cole+Porter/Anything+Goes