Men initiate sex more than three times as often as women do in a long-term, heterosexual relationship. However, sex happens far more often when the woman takes the initiative, suggesting it is the woman who sets limits, and passion plays a significant role in sex frequency, suggests a new study.

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Men initiate sex more than three times as often as women do in a long-term, heterosexual relationship. However, sex happens far more often when the woman takes the initiative, suggesting it is the woman who sets limits, and passion plays a significant role in sex frequency, suggests a new study.