To figure out how we pick mates, scientists have measured every shape and angle of the human face, studied the symmetry of dancers, crafted formulas from the measurements of Playboy models, and had both men and women rank attractiveness based on smelling armpit sweat.
After all this and more, the rules of attraction for the human species are still not clearly understood. How it all factors into true love is even more mysterious.
But a short list of scientific rules for the game of love is emerging. Some are as clearly defined as the prominent, feminine eyes of a supermodel or the desirable hips of a well-built man. Other rules work at the subconscious level, motivating us to action for evolutionary reasons that are tucked inside clouds of infatuation.
In the end, lasting love depends at least as much on behavior as biology. But the first moves are made before you’re even born.
Starting at conception, the human body develops by neatly splitting cells. If every division were to go perfectly, the result would be a baby whose left and right sides are mirror images. But nature doesn’t work that way. Genetic mutations and environmental pressures skew symmetry, and the results have lifelong implications.
Good symmetry shows that an individual has the genetic goods to survive development, is healthy, and is a good and fertile choice for mating.
“It makes sense to use symmetry variation in mate choice,” said evolutionary biologist Randy Thornhill of the University of New Mexico. “If you choose a perfectly symmetrical partner and reproduce with them, your offspring will have a better chance of being symmetric and able to deal with perturbations.” (…)
The structure of a person’s face also gives insight to fertility.
Estrogen caps bone growth in a woman’s lower face and chin, making them relatively small and short, as well as the brow, allowing for her eyes to appear prominent, Thornhill explained. Men’s faces are shaped by testosterone, which helps develop a larger lower face and jaw and a prominent brow.
Men and women possessing these traits are seen as attractive, Thornhill said, because they advertise reproductive health. (…)
Research reported last month found women both smell and look more attractive to men at certain times of the month.
And symmetrical men smell better.
Borrowing sweaty undershirts from a variety of men, Thornhill offered the shirts to the noses of women, asking for their impressions of the scents. Hands down, the women found the scent of a symmetrical man to be more attractive and desirable, especially if the woman was menstruating.
{ LiveScience | Continue reading }