Good looks, muscles, penis size are all a distant second to "functionality"---see the definition of it at the link to "Becoming a Porn Star" at the bottom LH side of the first page in the Guest's Section of my
www.davecummings.com. The article also tells ya the most effective way to get a shot (NO, there's no such thing as an audition, let alone with the porn girl of one's choice:-)).
Dave