> one of the standard test image (for early machine learning maybe?) was a woman in a suggestive pose (from Playboy or similar magazine if I remember correctly)
https://www.wired.com/story/finding-lena-the-patron-saint-of...
A brief report from a 1997 IS&T conference where Lena was a special guest (also SFW except for one link that has a warning next to it):
http://www.lenna.org/lenna_visit.html
An article from The Pudding about Lena's wish for her Playboy image to stop being used:
https://pudding.cool/2021/10/lenna/
And her Wikipedia page: