The company said it chose Ero-Advertising after several weeks of testing and is currently offering one prime banner spot at a flat price.
Text spots on the babe pages will soon be available, as will geo-targeting for advertisers interested in buying traffic per country.
More spaces on the site will become available once the company is comfortable with the site's traffic and advertising performance.
FreeOnes said most of its current traffic comes from western countries, 45 percent of which originates from the U.S.
“We are excited to be working with Ero-Advertising,” FreeOnes business manager Roald said.
“In the last few months they have proven themselves to be a great company with a lot of expertise in the field. Overall, they’ve just been great to work with.”
More information from Ero-Advertising.