The sex hormone testosterone, associated with a sense of machismo, makes men confident — maybe too confident, according to a new study from Caltech, the Wharton School, Western University, and ZRT Laboratory reported by the New York Post.

The nearly 250 men in the study were either given testosterone or a placebo, then asked to solve questions such as math problems.

The guys who just rubbed testosterone gel on themselves were more likely to answer quickly and wrongly. Those who lathered up with a placebo gel tended to take a little more time and guess correctly. The testosterone-fueled participants answered, on average, 20 percent fewer questions correctly.

The hormone either rendered guys less capable of performing a mental double-check, or simply made them too confident about their speedy decisions, said Caltech’s Colin Camerer, the Robert Kirby professor of behavioral economics, in a statement.

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