Post it on
www.elance.com That is where I look from custom jobs. I have been very ahppy with the results. But be very clear in what you want. If you are not you will get a bunch of general programmers out of India or Eastern Europe. But if you are specific in what you need you will often come across someone who has already made a script similar to what you need. It is up to you if you want to mention it is for an adult site. Some people have hung ups about doing work for an adult site.