TSYI meaning in General ?

The Seven Year Itch is a 1955 American romantic comedy film directed by Billy Wilder, from a screenplay he co-wrote with George Axelrod from the 1952 three-act play. The film stars Marilyn Monroe and Tom Ewell, who reprised his role. It contains one of the most notable images of the 20th century – Monroe standing on a subway grate as her white dress is blown upwards by a passing train. The titular phrase, which refers to declining interest in a monogamous relationship after seven years of marriage, has been used by psychologists.