Definitely a big market.
There are different things that you can do. You have sites like ManyVids which is great for recorded videos and such that you want to sell. Think of it like Etsy for porn. I know a lot of people who do well passively with that.
Then they normally have a private snapchat charging between $30 to $100 per month depending on the volume of pictures you have and such. A lot of people who have ManyVids have a private snapchat just for more advertising and cross-selling.
Then you have sites like reddit.com/r/sexsells and it's a gold mine. Now I could talk about the Reddit site as a whole in depth, and it's expansive but it's a great way to make money via pictures and videos. You can even have GFE kik (texting) sessions where you text them pictures throughout the week, and some light texting and get paid weekly for it. Definitely check this out.
Making sure to have an Instagram account (it doesn't have to be hobby affiliated SPECIFICALLY, probably shouldn't) where you are posting and gaining followers.
It's like running a small digital marketing firm (what I've done for years) for yourself as a product, but the payoff is huge.