"Major credit card companies should block payments to pornographic sites, according to a group of international campaigners and campaign groups who say they work to tackle sexual exploitation.
A letter seen by the BBC, signed by 10 campaigners and campaign groups, says porn sites "eroticise sexual violence, incest, and racism" and stream content that features child sexual abuse and sex trafficking.
One leading site, Pornhub, said "the letter [was] not only factually wrong but also intentionally misleading."
Mastercard told the BBC they were investigating claims made in the letter on pornography sites and would "terminate their connection to our network" if illegal activity by a cardholder was confirmed.
The letter was sent to 10 major credit card companies, including the "Big Three", Visa, MasterCard and American Express. The signatories from countries including the UK, US, India, Uganda and Australia have called for the immediate suspension of payments to pornographic sites."
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https://www.bbc.co.uk/news/world-52543508