Compile list of top adult sites and mailing newsletters

We need to hit the top 5,000 blogs which discuss things of sexual nature. You will need to compile a list of contact information for the blog owners so that we can submit a mass emailing to them with information about the contest at www.monsterhuntlive.com. Once the list is complied a newsletter about the contest needs to be send to the blog owners. Please let me know how many hours this will take, and how soon we can expect this to be done? I will choose a provider within the next two to three days. If this is succesful the provider will get many more mailing projects as this is a part of an ongoing promotion.