If you already own a website with adult content and want to make some more money from it, you will learn that many affiliate programs do not accept adult websites.
That's why you have to sign up with affiliate programs that accept adult websites - or even better, with adult affiliate programs who even provide a lot of content that you can add to your website - for free!
For free? There is an old saying "There is no such thing as a free lunch". But in this case, this doesn't apply. You can really get free adult content for your website! That's mostly photos (galleries with hundreds of pictures!), but also videos and text content which you can add to your website. The only condition usually is that you promote only the site that provides the content on the pages where you place their content - fair enough.
When you already have your own fully endowed website and don't need additional content, you can add just banners or text links to earn some (additional) money with your site.
Maybe you want to just start your own website, then you will need some content - you can get them with adult affiliate programs. Many of them offer two possibilities - you can host the content on your own website, or just link to fully designed websites provided by the affiliate program.
Webmaster referral is the cherry on the cake - refer other webmasters to one of the affiliate programs and earn additional money - you get paid when the webmasters referred by you make sales!
