Betsey Stevenson and Justin Wolfers' 2009 University of Pennsylvania study "The Paradox of Declining Female Happiness" found that marital happiness has declined for both men and women over the last 35 years, and as psychologist Gregory M. Herek told WebMD, marital dissatisfaction not only affects spouses' emotional well being but can also cause negative health effects.

However, unmarried women fare worse financially in retirement, not to mention the non-stop societal pressure on women to marry.

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