Figure 3.6 Two hypothetical graphs of the frequency of intercourse for common-law couples in a sample. In both, the average frequency is about three times per week, but in (a) there is little variability (almost everyone has a frequency between two and four times per week), whereas in (b) there is great variability (the frequency ranges from zero to 15 or more times per week). The graph for most sexual behaviour looks like (b), with great variability.
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