The researcher, Pepper Schwartz, said her work had found no such difference in divorce rates in the United States.

Risman, Barbara and Pepper Schwartz.

And its "sheer physicality is one of the last refuges of maleness," said Pepper Schwartz, a sociologist at the University of Washington.

"Finding the right people to delegate these things to is not easy," said Pepper Schwartz, a sociology professor at the University of Washington in Seattle.

Mr. Berger has secured contributions from more than one generation of sociologists (Jessie Bernard was born in 1903, Pepper Schwartz in 1945).

Pepper Schwartz, a sociology professor at the University of Washington, cautioned that so-called male adolescent humor does not appeal only to boys.

In their 1983 book "American Couples," Philip Blumstein and Pepper Schwartz cite a "non-monogamy rate" for women after two years of marriage of 21 percent.

Pepper Schwartz leads two lives.

"So we've had this dialogue for a long time," said Pepper Schwartz, a sociologist at the University of Washington who studies sexuality, family and gender.

"People are attracted by similarity or aspiration," said Pepper Schwartz, a professor of sociology at the University of Washington in Seattle.