Abstract
We conducted an in-person interview to examine the reliability of reported sexual histories among men over age 50 y with and without prostate cancer. Marriage and cohabitation were used as memory cues to recall sexual activity. High correlations on test-retest for questions evaluating sexual histories suggest reliable answers for most factors, and specifically for age at first sexual activity, and lifetime number of sexual partners. Low correlations were seen for ill-defined and socially undesirable items. These data suggest that men consistently report most measures of sexual activity when using marriage and cohabitation as memory cues to recall sexual histories.
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