i have heard that human beings who suffer from gonadal dysgenesis usually have enlarge breasts and prickled nipples. when this syndrome aggravates bleeding is associated from nipples and sometimes patient may contract Breast Cancer. This is a part of a theory that was discussed recently at who summit'09
Chemist
See John W. Nick Foundation, Inc. (malebreastcancer.org) whose mission is to educate the world about the risk of breast cancer in men, and to provide preventive and reactive measures to cancer through education and research.
Men get breast cancer too. The world doesn't know it yet.