Adnium.com now includes desktop 300x250 as well as mobile 300x100 traffic from Hentai sources such as Rule34.xxx, Gelbooru.com, XBooru.com, and Luscious.net!
Toon and Gaming offers, or anyone with a successful model for Hentai traffic should consider creating a white-list campaign with the above sources listed. There is plenty of daily volume to pick up, and remember, because we're a CPMv network impressions only count if your ad appears in the user's view-port.