Research has found that when heterosexual men are around an attractive woman, they experience a natural increase in testosterone and, sometimes, become more prone to engaging in physically risky behaviors. For instance, one study found that when male skateboarders performed in front of a female observer, they experienced elevated testosterone levels and attempted more dangerous stunts that increased their likelihood of crashing.1 Scientists theorize that this spike in testosterone leads men to engage in sexual displays that "demonstrate their value" or manliness. So does this happen every time heterosexual men are in the presence of the other sex? According to a new study published in Human Nature, this increase in testosterone does not occur when men interact with a woman they know is already committed to one of their friends.
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