Looking for titles to do with the sex trade

how do you do, fellow redditors

I'm looking for books, fact or fiction, to do with the sex trade. it's an area of interest for me and I've read a few titles to date, but I'm struggling to find others and am looking for some recommendations.

I'm not looking for what I'd call cheap thrill titles – nothing written purely for titillation.

I'm currently reading The Crimson Petal and the White (love it), Covent Garden Ladies, The Last Courtesan, In Company of a Courtesan, The Kings Concubine and The Darling Strumpet, as well as The Wolf Den. I did not enjoy all of those, but that's what I've covered this far. I've also read Healing Labour.

any ideas? I'm open to anything concerned with that topic, pretty much anywhere in the world, past or present.

thank you all in advance and I look forward to expanding my shelf!