The popular idea of a 7 year itch has some support in research. Surveys suggest that both the wish to cheat and actual cheating tend to be higher around the seventh year of marriage. For women, the risk appears to be highest in this period and then declines. For men, the risk also rises around year seven, then falls in mid marriage, and may rise again much later in long marriages.
Divorce timing fits a similar pattern. In the United States, marriages that end in divorce typically last about eight years. This sits just after the period when cheating risk is higher.
These findings come with limits. Much of the data is from heterosexual couples. Many results are based on self reports, which can be biased. Most studies are cross sectional, so they do not follow the same couples over time. Many surveys also do not separate consensual non monogamy, which is agreed to by both partners, from cheating.
The Journal of Sex Research – “I Swear I Will Never Betray You”: Factors Reported by Spouses as Helping Them Resist Extramarital Sex in Relation to Gender, Marriage Length, and Religiosity – 2018
Survey of married adults finds that men’s stated willingness to engage in extramarital sex tends to rise with relationship length, while women show a higher willingness in mid length marriages, then lower later. These patterns align with the idea that interest in affairs can change with time married.
Journal of Marriage and Family – A theory of marital sexual life – 2000
Using national U.S. survey data, the paper models how sex and infidelity vary across marriage length. It reports higher cheating risk around the seventh year, different trajectories for men and women, and later life increases among men.
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