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There are hundreds of scientific studies looking at the frequency of intercourse (because when they say sex, they usually mean intercourse, and when they say the couple, they mean the straight couple). With so many studies out there, the numbers you get depend largely on where you look, who was asked, and how they were asked. These numbers include people who were and were not in committed relationships. In one of the largest U. There was, in fact, little difference across the decades, and looking at men and women from ages 20 to 45, they reported between 6.