Now all that locker room machismo makes perfect sense. It turns out men are more insecure about their penis sizes in front of other male competitors than their sexual partners.

A recent study from Victoria University in Melbourne shows that men who experienced locker room syndrome" mostly reported they were in fact happy with their size when it came to personal satisfaction and that of their sexual partners'.

Or you could read the findings another way: "The size of a man’s genitalia might matter when it comes to sex, just not for men themselves. They’re more concerned with what the guy next to them has," notes the National Post.

"Men’s preoccupation with size was rarely to do with pleasing sexual partners or even appearing as a better sexual partner, says the study's author, clinical psychology graduate Dr. Annabel Chan Feng Yi, in a release. “It was often more about competition with other men. Many felt most insecure about their size in environments where other men might see them, such as gym change rooms.”

The study surveyed 738 men online and found an obsession with weight and being muscular was also common among the respondents, especially among gay men.

“The research demonstrates that societal pressures on body image are certainly not unique to women and that while men share similar body image concerns they often don’t have the appropriate forum to discuss them or adequate professional support to deal with them,” added Dr. Chan Feng Yi.

The sizable findings come on the heels of a similar Canadian study, which concluded that penis length does in fact sway females evaluating potential sexual partners.

A University of Ottawa researcher determined that men with larger penises were rated relatively more attractive. "Flaccid penis size had a significant influence on male attractiveness," said the report, published in the Proceedings of the National Academy of Science.

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  • Marathon Sex Is Not the Norm

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  • Guys Fake Orgasms, Too

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  • You Can Break Your Penis

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  • Circumcised Or Uncircumcised? Depends Where You Live

    In the United States, the majority of males are circumcised as babies — but that’s not the case around the globe. According to the World Health Organization, only about 30 per cent of penises worldwide are circumcised. Even in America, the percentage is falling (the CDC recently reported that circumcision is slightly less common than it was a decade ago, dropping to about 57 per cent from 63 per cent). And the American Academy of Pediatrics no longer recommends routine circumcision, citing health reasons.

  • Bikes Can Be Bad for Your Sex Life

    Here’s a little-known fact: Riding a bicycle with a skinny seat can put enough pressure on a male’s anatomy that it causes erectile dysfunction. Those narrow seats may make men look like road racers, but all their body weight is riding right on the part of the pelvis that supplies blood vessels and nerves to the penis. The solution is to opt for a fat, padded seat that supports the bottom. It may not look cool, but your sex life will thank you.

  • Smoking Can Cause Erectile Dysfunction

    Just in case you need one more reason to kick your cigarette habit, consider this: Smoking has been shown to double the risk for erectile dysfunction. That's because nicotine causes blood vessels to constrict, decreasing blood flow to the penis — which can be deadly for an erection. Other studies have shown that smoking decreases the number of sperm in a man's semen and that non-smokers (who tend to be healthier overall) have a better sex life.

  • It's Not Just Down Below: Men's Brains Are Wired Differently, Too

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  • Male Anatomy Has a Long Shelf Life

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