Create Adult Website like http://www.eros-la.com/eros.htm

Looking to build an adult website where advertisers can create accounts and post their ads. The ads will have to generate meta tags so each and every ad will be picked up by search engines and site will be optimized with? the content of each ad. Must have strong administrator back end including ability to add/edit delete ads,users and content,send newsletters to users and escorts. Escorts to be able to create accounts and add/edit ads and renew and pay for their ads as they need to. Escort be able to put their ads on hold for a specified time. ? All graphics must be supplied and must be of high quality ***VERY IMPORTANT!!!! MUST BE SEO FRIENDLY AND OPTIMIZED!!!***