Images used as teaching AIDS depict women doing domestic tasks or merely observing while men perform technology-related tasks, such as repairing cars, wiring, replacing light bulbs and so on.

Dr Camille Ferdenzi, of the University of Geneva, and his team measured the digit ratios (the 2d: 4d ratios) of 49 men, and then presented their pictures in random order to female participants.

And when asked to rate photos of differently shaped male bodies, almost 80% of men and 65% of women favoured a very muscular physique.