One interesting business model that I have seen, is using a file upload company whether it be your own, or being an affiliate or partner of some sort.
Such as Uploading all images and video to this file upload company. (If using your own then use offshore DMCA ignored servers) then charge and setup a payment gateway such as stripe or any other so that users pay for access to the file upload service where they then use that system to download your content. Some sites will allow content to be dowloaded like this for free, but at extremely slow speeds. Free making the customer get lured into the content and site, but so slow that they give in and up paying for the fast download speed plans.
So essentially you open or partner with a DMCA ignored file upload service setup a payment gateway on that and take payments for non adult content but for a file upload service.
I have also seen verotel being used for copyrighted membership sites. They charge 500 euro a year to use them and %15 per transaction.