I have known of credit cards that will deny online purchases, especially if the site isn't verified through whatever company the credit card company wants. It's a matter of security. (From what I can understand, a big number of credit card ripoffs come from little websites that aren't verified, and if your number is stolen, the company has to work harder than it needs to). If you want your porn so bad, go out and get one of those prepaid debit cards from the drug store and use it there. I don't think 6.95 is going to raise your credit score that much.