A male model falls on the Vivienne Westwood Fall/Winter 2010/2011 menswear runway in Milan. Photo: AFP/ Getty Images

(Of course, anyone who's seen a Jim Carrey or Ben Stiller movie could have told you that.)

Psychologists at the University of Queensland in Brisbane, Australia studied young male skateboarders with and without the presence of female onlookers to see how the men reacted, according to the paper.

Researchers reportedly found that the men "took more risks when they were observed by an attractive female than when they were observed by a male."

"This increased risk-taking led to more successes but also more crash landings in front of the female observer," researchers say.

A saliva test also reportedly detected increased testosterone levels when the beauties were present, confirming what researchers believe to be an evolutionary impulse.

"Historically, men have competed with each other for access to fertile women and the winners of those competitions are the ones who pass on their genes to future generations," Professor Bill Von Hippel, the lead researcher, told the Daily Mail.

"Risk-taking would have been inherent in such a competitive mating strategy. Our results suggest that displays of physical risk-taking might best be understood as hormonally-fueled advertisements of health and vigor aimed at potential mates, and signals of strength, fitness and daring intended to intimidate potential rivals.

"Other instances of physical risk-taking that contribute to men's early mortality, such as dangerous driving and physical aggression, might also be influenced by increases in testosterone brought about by the presence of attractive women."

Oh, sure. Blame us. In the meantime, we'll start carrying around elbow pads and helmets, just in case.

And read why curvy women give men a high similar to that of drugs and alcohol.