Perhaps psychologically, sympathy pains allow the man to go through the pain with the woman, so she doesn't have to do it alone. According to one article I unearthed on the subject, though, there is a biological foundation for these feelings. Men with pregnant partners were shown to have an increased level of estrogen and a decreased level of testosterone in one test.
William Blake (1757-1827) , English artist, mystic and poet wrote Songs of Innocence (1789): a poetry collection written from the child s point of view, of innocent wonderment and spontaneity in natural settings which includes Little Boy Lost, Little Boy Found and The Lamb;
Blake, who wrote several novels, is best known for Dances With Wolves, which he wrote while broke at the urging of his longtime friend, the actor Kevin Costner. The novel was fairly unsuccessful, but it became a film after Costner asked Blake to adapt it into a movie. Costner then went on to star in the movie.