If you're seeking some digital titillation, don't try to use your American Express card for the experience.
"American Express' policy does not allow the acceptance of the card for digital adult content," says Leah Gerstner, a company spokeswoman.
This rule has been in place since 2000, even though it's federally legal to use a credit card to purchase most online adult entertainment.
One reason for the ban: AmEx says customer disputes with online adult-industry companies increased administrative costs. The ban extends to American Express gift cards and prepaid cards as well.
Visa declined to comment, while Mastercard and Discover did not respond to inquiries about their online pornography purchase policies.