Professor Joanna Scurr, a world expert in breast bio-mechanics, said: 'In all women, their right and left breasts move differently, depending on the mass and how elastic they are.
His mother gasped but she didn't seem to be in pain, in fact she pushed herself back, impaling herself on her husband's phallus.
Nearly one-in-five women say they their chest stood in the way of them keeping fit.