Word: scent
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...advances scientists are making deciphering the biology of love--for all the circuitry appearing in brain scans and the chemistry emerging in blood and scent studies--we still want to believe that science will never tame romance. We're sure that it will always remain utterly separate from the cells and organs and reflexes that biologists study. And indeed, how could anything that so moves us to poetry and song be so reducible to behavior and chemicals...
...best-known illustration of the invisible influence of scent is the way the menstrual cycles of women who live communally tend to synchronize. In a state of nature, this is a very good idea. It's not in a tribe's or community's interests for one ovulating female to monopolize the reproductive attention of too many males. Better to have all the females become fertile at once and allow the fittest potential mates to compete with one another for them...
...does one female signal the rest? The answer is almost certainly smell. Pheromones--or scent-signaling chemicals--are known to exist among animals, and while scientists have had a hard time unraveling the pheromonal system in humans, they have isolated a few of the compounds. One type, known as driver pheromones, appears to affect the endocrine systems of others. Since the endocrine system plays a critical role in the timing of menstruation, there is at least a strong circumstantial case that the two are linked. "It's thought that there is a driver female who gives off something that changes...
...Precise as the MHC-detection system is, it can be confounded. One thing that throws us off the scent is the birth-control pill. Women who are on the Pill-which chemically simulates pregnancy-tend to choose wrong in the T-shirt test. When they discontinue the daily hormone dose, the protective smell mechanism kicks back in. "A colleague of mine wonders if the Pill may contribute to divorce," says Wysocki. "Women pick a husband when they're on birth control, then quit to have a baby and realize they've made a mistake...
...only does kissing serve the utilitarian purpose of providing a sample of MHC, but it also magnifies the other attraction signals-if only as a result of proximity. Scent is amplified up close, as are sounds and breaths and other cues. And none of that begins to touch the tactile experience that was entirely lacking until intimate contact was made. "At the moment of a kiss, there's a rich and complicated exchange of postural, physical and chemical information," says Gallup. "There are hardwired mechanisms that process all this...