As expected, women performed better at this task than men did, but when the scientists looked at the results by finger size, they found that the sex difference disappeared: On average, men and women with the same size fingertips perform at the same level, the team reports in the 16 December issue of .
(Finger size does not explain all individual variability, however; there are differences between people with the same size fingers, perhaps as a result of differences in the mechanical properties of skin or in how each person's brain processes the information.) The researchers also came up with a potential explanation for the size effect.
(What, you may ask, about actual incidences of extramarital sex?
Starting only in 1991, the GSS asked respondents “Have you ever had sex with someone other than your husband or wife while you were married? True, the 15 percent figure may be way off, but if Americans have really become more libertine, you’d expect at least more willingness to admit infidelity.
Gallup’s non-trend for adultery puzzled some, including the Gallup folks.
Sometimes a difference between the sexes is not based on sex at all.Women have a finer sense of touch than men do, but a new study shows that this is simply because their fingertips tend to be smaller.Neuroscientist Daniel Goldreich of Mc Master University in Hamilton, Canada, and his colleagues first became curious about the sex difference while studying differences between blind and sighted people.Cells in the finger called Merkel cells appear to transmit this type of touch information to the brain.Goldreich and his co-workers measured the number of Merkel cells in their subjects' fingertips and found that everyone had about the same number, regardless of finger size.