A program owner I know once said:

"There is enough content already filmed that we could all stop filming and the surfers wouldn't notice for 10 years"

I also know another program owner who films very little new content and rotates the existing content on a 4 month cycle. They've found that doing that with only a few new scenes per month is all they need to keep their members happy with their rebill cycle.

Every day there are new adult customers, for whom all of this content is new.

As webmasters, we can often forget that because we see much more than the average customer.