Despite lots of evidence to the contrary, it seems that size really does matter -- especially to men.
In fact, in one English study, 85 percent of women said that they were satisfied with their partner's penis size. You'd think that would be good news for guys. Instead, only 55 percent of men indicated satisfaction with their equipment [source: LiveScience].
Another interesting finding was that more guys who had normal-sized penises were actually afflicted with small penis syndrome (SPS) -- aka locker room syndrome, or the anxiety that one's penis is too small when it really isn't -- than men who had penises with a length less than 3 inches (7.6 centimeters), known as micropenis.
So what exactly is normal-sized? The average non-erect penis measures between 3 to 4 inches (7.6 to 10.2 centimeters) and grows to 5 to 7 inches (12.7 to 17.8 centimeters) when erect.
So ignore the products that promise a bigger, better you, and don't stress -- especially since stress can lead to erectile dysfunction issues and problems with premature ejaculation.