American Express had previously disallowed the use of its card for adult ads on the site, said spokeswoman Sanette Chao.
Some of these retailers may place a surcharge on ALL credit cards that go through their checkout.
Again, you will be informed of this during the checkout process.
American Express cards come in two formats: those issued by American Express itself, and "companion cards", which are available from most major Australian banks.
With a companion card, you'll receive an American Express card and either a Visa or Mastercard as well.
Once approved for your American Express card, you’ll automatically be enrolled in American Express Membership Rewards.