We have always been told that the reason why a vast majority of women aren't able to reach orgasm through penetrative sex is generally down to psychology, penis size, and the ever-elusive G-spot.
Well recently it has been found through a study conducted by Clinical Anatomy, that in fact the shape of the female anatomy is what makes the difference. The study found that women who have a clitoris located 2.5 centimeters or less from their urinary tract will be able to orgasm through penetration a lot easier than women who have a distance of over 3 centimeters.
It is believed that the smaller the space between the clitoris and the urinary tract, leads to more friction and stimulation around the clitoris, therefore making it easier to orgasm.
Whether or not this actually does have an effect it would be interesting to know how many women have pulled out a ruler after hearing about this one!