my antropology professor told us about a certain culture where the men act as if they were pregnant, and the women act as if they are not when they are. They attribute morning sickness to some other cause, and all of the other aliments of pregnancy. The men, after the birth, go through all of the biological feelings a woman usually goes through after the birth. (he said mind over matter deal here) It sounds really interesting, if he remembers the name of the tribe, I'll research it and post it.