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Article The Myth, the Math, the Sex by GINA KOLATA:

August 12, 2007

One survey, recently reported by the federal government, concluded that men had a median of seven female sex partners. Women had a median of four male sex partners. Another study, by British researchers, stated that men had 12.7 heterosexual partners in their lifetimes and women had 6.5.

But there is just one problem, mathematicians say. It is logically impossible for heterosexual men to have more partners on average than heterosexual women. Those survey results cannot be correct.

“Some might be imaginary,” Dr. Graham said. “Maybe two are in the man’s mind and one really exists.”