I am wondering, along with MM, what am I missing in Bonnie Ship the Diamond?
The Dalliance records have already been mentioned - LOTS of good songs there. [I didn't know there was a third one! I'll have to look for it.] Plus, when you get these, you have a ready-made trivia question for your theatre-fanatic friends - What well-respected older actor once played on a record of bawdy songs? (Alan Arkin)
Saffire introduces Silver Beaver by saying that, since bluesmen have a long tradition of singing about their snakes, roosters, etc., they thought it was time to introduce a FEMALE blues animal into the mix.....;-)
You might see if you can find some of Julia Lee's old recordings too - she was a master (mistress?) of the risque - (eg - "My doorbell ain't been working/my hallway's full of dust/my vestibule is musty/my keyhole's full of rust/but tonight's the night...")
And, of course, you must either start or end the evening with Tom Lehrer's "SMUT" ("I've never quibbled/if it was ribald,")