A cross-national comparison of the relative influence of male and female age on the frequency of marital intercourse

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Abstract
Summary Parallel analyses of recent data from the United States, Thailand, Belgium, and Japan all confirm the finding that female age and not male age is the more important contributor to the decline in frequency of marital intercourse during the childbearing ages. The most probable explanation is the decline in female (but not male) androgen levels during the age span examined.