is a book written by American author and relationship counselor John Gray. The book states that most common relationship problems between men and women are a result of fundamental psychological differences between the sexes, which the author exemplifies by means of its eponymous metaphor: that men and women are from distinct planets—men from Mars and women from Venus—and that each sex is acclimated to its own planet's society and customs, but not to those of the other. One example is men's complaint that if they offer solutions to problems that women bring up in conversation, the women are not necessarily interested in solving those problems, but talking about them. The book asserts each sex can be understood in terms of distinct ways they respond to stress and stressful situations.