Very easy to say. Now let's think of how we can do it.
10 cents a scene?
$1 a scene?
Or nothing a scene and as much as you like when you like it?
I pointed out the flaw in this a while back, but will restate it.
If someone wants a Radiohead record and there's a very cheap version available. People may buy it.
If someone wants a Brazzers version of a porn scene and there are scenes available for a low price. There are lots of other brands very similar available for free in as much quantity as needed.
This was an idea I came up with years ago and it was rightly ridiculed. I still think launching sites with 20 scenes approx for $5 is a good idea.
What we have to always consider is porn is a very different product to most other online product.
Unlike Google we don't have a bottomless pit of people who will give us money to advertise. Monetising porn traffic isn't the same as monetising SE traffic.
Most porn is pretty average, because there simply isn't the money in porn to produce a truly great product.
Porn surfers are very focused. They have an erection to deal with.
Most porn in a niche and style is very similar to other versions.
Once a porn scene is seen it's done, gone and forgotten.
Few scenes are viewed over and over again.
A good porn scene is 20 minutes of pleasure, then the viewer will get on with his life.
Comparing monetising porn traffic with what FB, Google, YT do. Is like feeding a cow what a chicken eats because they both live on a farm.