I found this article in Men's Health magazine.
http://www.menshealth.com/cda/article.do?site=MensHealth&channel=health&category=other.diseases.ailments&conitem=de0a85106c144210VgnVCM10000030281eac____&page=0&print=true&url=http%3A%2F%2Fwww.menshealth.com%2Fcda%2Farticle.do%3Fsite%3DMensHealth%26channel%3Dhealth%26category%3Dother.diseases.ailments%26conitem%3Dde0a85106c144210VgnVCM10000030281eac____%26page%3D0
Enjoy =)