>>379750728
A lot of adult services/sites, at least way back when I was still a kid, just "charge" your card (Authorization) and then don't actually collect payment (Settlement)
This allows them to verify you have a real credit card that they can take payments from, which at least back then was a PRETTY decent indicator you were an adult. Nowadays every fucking kid has their mommy/daddy's card on their smartphone so it doesn't really mean as much - but still, any decent parent should see a $5 "ADULT CONTENT AUTHORIZATION" statement on their card and go "What the fuck?"
In any event I wouldn't charge for adult content, just authorize a valid card because I think that's their only legal obligation. It's that or request real ID verification from you, but I doubt most people would agree to that and I would want a legally binding agreement they will delete my personal information within 24 hours of receiving it rather than storing it on their server/selling it.