Genetic Errors Nixed Penis Spines

I figured that title might attract some hits. Read this article on wired today. Sounds like a good error to me but not sure.

http://www.wired.com/wiredscience/2011/03/deletion-human-evolution/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+wired%2Findex+%28Wired%3A+Index+3+%28Top+Stories+2%29%29