I'm no expert, but I think actionable feedback we can do is...
- E-Mail the payment processors at Visa/Mastercard your Feedback and voice your frustration at whatever e-mail you can find of them online
- Start using Cash payments wherever possible. Want to buy a Steam Game? Buy a Steam Gift card from your local convenience store with cash and get your game that way. I know, it's not as practical, but they need to understand that they will lose money with this decision.
- Raise awareness about this with people you trust - obviously, be careful about this one, because the topic at hand is very delicate, and most people in real life aren't going to share your passion for Adult Games.