In today's NY Times, Gina Kolata writes about self-report surveys that consistently find that, on average, men report having had more opposite sex partners than women. Kolata points out that something is amiss in these reports because it is logically impossible for men to have had, on average, more opposite sex partners than women. Experts Kolata spoke with for the article proposed several possible explanations including over-reporting by men and under-reporting by women, but Kolata's experts said that the reason for the discrepancy isn't really known.
Maybe they overlooked the findings from this clever fake lie-detector study. The results of this study point toward under-reporting by women rather than over-reporting by men.