seven-year itch

noun

1. scabies.
2. the temptation to have an affair, held to become a hazard in the seventh year of marriage.

noun

1. informal a tendency towards infidelity, traditionally said to begin after about seven years of marriage

n.1899, American English, some sort of skin condition (sometimes identified with poison ivy infection) that either lasts seven years or returns every seven years. Jocular use for “urge to stray from marital fidelity” is attested from 1952, as the title of the Broadway play (made into a film, 1955) by George Axelrod (1922-2003), in which the lead male character reads an article describing the high number of men have extra-marital affairs after seven years of marriage.