Size does matter — at least in the locker room.

Most men are more self-conscious about the size of their manhood when they are casually around other males than when they are with their sexual partners, according to an Australian study.

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Victoria University clinical psychology doctoral graduate Annabel Chan Feng Yi conducted an online survey of 738 men between the ages of 18 and 76. She found that most were insecure about their body image, weight and penis size.

"Men's preoccupation with size was rarely to do with pleasing sexual partners or even appearing as a better sexual partner," Chan said in a news 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."

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Many men are more self-conscious about their penis size around their mates than their dates, according to a new study.

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Men who experienced what Chan referred to as "locker room syndrome" were actually satisfied with their size when it came to bedroom activities with their significant others.

An obsession with bulking up was also common, especially among gay respondents, the release said.

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"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," she said.

The study also highlighted the need for further research incorporating the experiences of men facing obesity and its implications.