Yes, it's official, men are from Mars and women from Venus, and here's the science to prove it - Telegraph

"The first big surprise happens before birth. All men in the world today are essentially biologically modified women, because we all start our embryonic lives as females (that is why, for example, men still have breasts, even though they serve no function). The biological differences that can be found between the bodies and brains of males and females are largely due to the way these embryos develop in the womb."