Several adult ad networks support the OpenRTB protocol. ExoClick is a prominent network that offers programmatic advertising through OpenRTB. JuicyAds also supports OpenRTB, enabling real-time bidding for adult traffic. TrafficJunky provides OpenRTB integration for advertisers and publishers in the adult niche. AdXpansion is another network that utilizes OpenRTB for efficient ad placements. EroAdvertising offers programmatic solutions with OpenRTB support. These networks allow you to access a wide range of ad inventory through real-time bidding. You should review each network's policies and features to choose the best fit for your needs.