Is there a place (other than games forum) that people have listed their erotica books to trade or sell?  Or even just have listed ones they've enjoyed?

There are a lot of threads here in the Love and Romance forum about erotica. I've noticed they move very quickly from shelves, so if you haven't already you may want to start adding them to you wish list. I would say though your best bet is to check back here for suggestions and every now and then you can even find some here for swapping if you're lucky. Also try posting a wanted post in the book bazaar forum...it's worth a try.

Good luck!

A lot of those are WLed, so they are harder to find posted.  Keep an eye on the thread in this forum called "Is this on your WL (currently #7)", because a lot of us offer up WL books there before posting them to FIFO.  I have posted and received several erotica books this way.