Men usual have short faces between the brow and upper lip, which makes their jaws appear larger, their cheeks more flared, and their eyebrows more pronounced.
Dr Eleanor Weston, a palaeontologist from the museum, examined 68 male and 53 female skulls from the University of Witwatersrand in South Africa.
She said: “We divided the distance between the brow and upper lip, by the width of the face. The lower the result, the more masculine the appearance of the face.
“It is difficult to explain why men have evolved shorter, broader faces if it is not because women find them more attractive.”
As the male face has become shorter and broader, the canine teeth have shrunk, so men look less threatening and more attractive to mates.