We have found and tested a new adult e-commerce store (also 3rd party billing option) for small business owners and models. They pay higher than big payment processors like epoch, vendo etc. %85 revenue share is great on them.
You can't create recurring billings on them but you are available to sell any products through their checkout pages without paying MasterCard and Visa annual high-risk fee.
So if you are just looking for checkout options with lower processing fee's then good to go with indiebill:
Register to Indiebill!