It seems to me that if the "hard to differentiate" hypothesis were true, we'd see it in other species. Many other species are a lot less sexually dimorphic than humans, and I'm not aware of any species in which it is even rare, much less common, that males nurse the young.
The reason men have breasts is that we all start out with the same bodies; androgens masculinize the fetus. (Cases of androgen insensitivity syndrome show what happens when you don't get androgens or you do not respond to them. <http://en.wikipedia.org/wiki/Androgen_insensitivity_syndrome>) I suspect that the root of breast cancer in males (which is more common than we'd think) lies in the fact that males have breast tissue, too. m ------ "There is no power for change greater than a community discovering what it cares about." -- Margaret Wheatley -----Original Message----- From: Michael Sylvester [mailto:[EMAIL PROTECTED] Sent: Monday, September 17, 2007 1:05 AM To: Teaching in the Psychological Sciences (TIPS) Subject: [SPAM] - Re: [tips] Spontaneous lactation - Bayesian Filter detected spam I am not sure where I am getting with this but I will try. There was a theory going around that in the early days of human evolution it was very difficult to differentiate between the sexes and that sexual roles were not that highly differentiated.So it could be possible that some nursing capacity (though miniscule) could have existed in males. It would be interesting to discover the roots of breast cancer in males. Michael Sylvester,PhD Daytona Beach,Florida --- ---
