The dictionary definitions of convent and monastery do not include married men and women and single persons living separate lives in separate households.

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And that spells more stock market participation for married couples than for single men and women.

FORBES: Why Married Couples Should Look Over Their Portfolios Together

Very roughly, in the past half-century the average weekly hours worked by married women have tripled, while hours worked by men and single women have stayed about constant.

ECONOMIST: The economy

In fact, married couples generally perform better than single men and women, at least when it comes to retirement investing.

FORBES: Why Married Couples Should Look Over Their Portfolios Together

Married men dial risk down and hitched women tend to own more stocks than they would when they were single.

FORBES: Why Married Couples Should Look Over Their Portfolios Together