https://gpsteward.com/
Hey guys. I just launched my service. We're offering it to the webmasters of GFY. The list of 600 domains is mostly mainstream but, if you apply for an account and send in a support ticket asking for adult friendly domains, I might be able to find a few for you. We do have LGBT bloggers and the like in our inventory and I think those webmasters would be OK with an adult guest post.
If not, we'll happily work with your mainstream site! By adult, I mean hard core porn. If it's something like adult dating, it's fine.
I don't check here regularly but if you have a question, email me or use the contact us form. You can also book a zoom meeting if you wish!
Let me know.
-Constantine