When Sex Leaves the Marriage

Why do some couples sizzle while others fizzle? Social scientists are studying no-sex marriages for clues about what can go wrong in relationships.

Married men and women, on average, have sex with their spouse 58 times a year, a little more than once a week, according to data collected from the General Social Survey, which has tracked the social behaviors of Americans since 1972. But there are wide variations in that number. Married people under 30 have sex about 111 times a year. And it’s estimated that about 15 percent of married couples have not had sex with their spouse in the last six months to one year