What body organs are involved in menstruation? Do some men possess #1? 
Menstruation
Menstruation can occur in any human being who has a uterus and vagina.  People who are born with a vagina may transition socially and/or medically to being male.  Someone with a vagina who has transitioned to being male is a man. 
Regular discharge of blood and tissue from the inner lining of the uterus through the vagina
Are there people who are men who experience menstruation?