There are some stories circling around about man breast feeding. Humboldt wrote about it.
What is know about this? Is this really lactation?
Yes it is possible. See Father's Milk Discover February 1995.
We’ve known for some time that many male mammals, including some men, can undergo breast development and lactate under special conditions.
Breast development occurs commonly, and spontaneous lactation occasionally, in men under conditions of starvation. Thousands of cases were recorded among prisoners of war released from concentration camps after World War II; one observer noted 500 cases among survivors of one Japanese POW camp alone.