"Scientists in Philadelphia have established for the first time that the human body produces pheromones, special aromatic chemical compounds discharged by one individual that affect the sexual physiology of another. Although animals have long been known to secrete pheromones, which typically function as sex attractants, and although the existence of such chemicals in humans has long been speculated, the new research is the first to establish their existence in humans.

It's remarkable. A very clear pattern has been emerging and it confirms that a woman's optimal reproductive health is a part of a finely tuned system and that a man, on a regular and sustained basis, is an essential part of it," said Dr. Winnifred B. Cutler, who has led the research effort. "It wasn't clear until our most recent studies how important male essence really is," she said, "but now that we know this, it helps to explain our earlier findings. You might say that exposure to pheromones  is the essence of sex."

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Chemicals in men's bodies can cause their female sex partners to be more fertile, have more regular menstrual cycles and milder menopause, landmark research shows. And women who have sex with men at least once a week benefit most from the chemicals, which apparently work through the sense of smell.

"The exciting part is the effect we have on each other. Men are important to women," says Dr. Winnifred B. Cutler of Philadelphia, whose studies show for the first time that chemicals called pheromones exist in humans. Pheromones have long been known to exist in animals, as scents that attract sex partners. Cutler's new studies...show women are affected by pheromones from men and women."