For a long time, we published eBooks on Amazon, but they had a policy change 5 or so years ago (from memory!) saying they were no longer publishing what they considered, "Pornography".
I noticed earlier today though that 2 of our eBooks (we used to repackage our best stories, competition entries or individual longer stories) are still published on Amazon - so they aren't deemed outright pornography in Amazon's eyes:
https://www.amazon.com/Lush-Erotica-Stories-Authors-ebook/dp/B00838YM8C/ref=pd_sbs_4[…]1f4-bc7c-b419f178a05f&pd_rd_wg=M2j7M&pd_rd_i=B00838YM8C&psc=1
https://www.amazon.com/VIP-Sex-Stories-Lush-Authors-ebook/dp/B0096IQEZM/ref=sr_1_1?k[…]+erotica&qid=1637068249&rnid=2941120011&s=digital-text&sr=1-1
In theory then, if sex scenes are part of an overall story, then they should be fine. Their content guidelines say as much: https://kdp.amazon.com/en_US/help/topic/G200672390 (cough, 50 Shades of Grey).
Here's a recent article on the subject too, which shows many are clearly getting published: https://redlightnetwork.net/sell-erotica-on-kindle/
I am thinking of publishing again on there. The best of the latest competition entries would be a good test for example (price = free), as they are longer and have more of a plot than your typical interweb "sex story".
Does anyone here have experience of publishing on Amazon (via KDP) over the last year or so? What did you publish? What is accepted as "ok" with them?