A survey carried out by Victoria University clinical psychology doctoral graduate Annabel Chan Feng Yi reveals that men are more worried about the size of their penis when they are with their male friends than being with their girl friends.
Around 738 men between 18 and 76 years of age took part in the online survey where they admitted being insecure about their weight, build and penis size.
However the most surprising admission for Dr Chan was that many were insecure about comparing their size with other males rather than worrying what their girlfriends thought.
"Men's pre-occupation with size was rarely to do with pleasing sexual partners or even appearing as a better sexual partner. 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", Dr Chan added.