I found DeepSeek R1 (better for questions) and V3 (better for prose) to be very willing to discuss sex with a simple system prompt, as well as being very pleasant in articulation. I guess, I prefer them because they are almost SOTA and very large.

Not through the official interface though. Needs to be hosted by a third party. OpenRouter has a generous free tier for both.

I just saw that there is an abliterated version as well. Not sure how to try it though.