Mobile traffic is most valuable, so you need to make sure you monetize it correctly. The best way to go these days (based on multivariate testing) is to use these three ad networks together, and in this order:
Plugrush ->
Juicy Ads ->
Sex Goes Mobile
You can actually go with
Sex Goes Mobile by itself, for the most part, since it converts really good (especially from "good" countries) and it generates a lot of profit.
But for the first method, get a text link from
Sex Goes Mobile, add it to the end of the url from
Juicy Ads, and in the end, set it as an alternate url at
Plugrush.
As far as all other types of advertising, use
Ero Advertising. They pay better than all other xxx ad networks these days.