7 year itch
Men may remember The Seven Year Itch as the 1955 Hollywood classic famous for its iconic image of Marilyn Monroe but the phrase has quite a different connotation for women. Psychologists use the term to refer to men’s increasing tendency to stray after the seventh year of marriage.
Why seven years, you may ask. Relationship experts give a rough break up: first two years of marriage fly off in getting to know each other; the next three in the excitement of becoming parents and raising the first child; the next two in planning the second pregnancy and managing two tiny tots.