You can monetize traffic on an adult niche website by using affiliate marketing. You should promote adult-related products or services through affiliate links. Displaying adult ad networks like ExoClick or TrafficJunky can generate revenue from banner ads or pop-unders. You can also offer premium memberships or exclusive content for a subscription fee. Selling digital products like adult videos, ebooks, or guides works well too. Another option is to partner with adult brands for sponsored content or ads. Email marketing can also help by sending offers and promotions to your subscribers. Always test different methods to see what works best for your audience.