Hi there and welcome
Papayl have a policy to not allow their service for use with Adult Sites so it is very limited.
But one site that has gotten around this is http://sexier.com
When you go to pay you buy Epoch credits which are purchased via Paypal, which hides the purchase from paypal.
Its a bit of a roundabout way but its to get around the rules of paypal.
If you would like any additional information or assistance, please do not hesitate to let me know.
Else if you can take a second to rate my service by clicking one of the stars at the top of the screen then submit, that would be greatly appreciated.
Please let me know