Many self-published authors have received a notice from Bookstrand saying:
"We were informed by PayPal, without notice, and by our credit card processing company, that we are required to remove all titles at BookStrand.com with content containing incest, pseudo incest, rape, and bestiality, effective immediately."
It will be interesting to see exactly how they interpret those categories. History suggests that the answer might be: 'broadly'.
More details here.