I have looked into crypto a few times for these kinds of sites - it's been some months, so maybe it's changed, but last I researched telling someone to spend crypto (in/from the US) - was fairly complicated, added many more steps, and actually added more details about you and your shopping to more third parties.

If you have a suggestion for teaching someone how to get crypto in the US and send it to an adult site with less steps than it takes to use a visa/mc and without the end user needing to give up more PII(?) (personally identifying info) to more people (than you would by simply using a visa prepaid card with a single merchant) - then I would really like to know about such a guide.