Among publicly available affiliate programs for general traffic
Adult Webmaster Porn Affiliate Program - PimpRoll is your best choice. They support affiliates well, they have a ton of sites to choose from including new 4K content sites, they offer plenty of promo tools and most importantly they have paid on time every single time for more than ten years in a row.
If you have specific traffic and access to private programs you may find other offers worth considering as well.