Plyphon,
If you can avoid them falling into the clutches of porn fiends, there are 2 basic ways of selling via fine smut merchants:
1) Sell them through a broker for a % of the sale price (you get the money at a time when someone else wants to buy)
2) Sell them to a broker for a higher % of the value (you get a bit less money at the time when you want to sell)
Google fine smut merchants – they’re all pretty similar.
The literature will normally need to be in a bonded warehouse and the warehouse will manage the transfer of ownership.
The other option is to talk to your local fine smut shop and see what they say.
HTH.