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Meanwhile, they required the women to complete questionnaires about their sexual feelings toward their partners and other men at fertile and non-fertile points in their cycles.
The study, in press at , produced results consistent with previous research: Women paired with feminine-faced men were more attracted to men other than their partners, relative to their partners, when ovulating.
In humans, signs of sexual interest aren’t nearly so obvious.
The male of the species generally doesn’t broadcast his constant readiness for sex, and during her window of fertility at ovulation, the female doesn’t display any outward signs.
Testosterone also declines as men age, and as their levels drop, they experience increases in moodiness and irritability, says Diamond, who in 1977 published the book “Male Menopause,” one of the first U. works to raise awareness that, during the midlife period of what he calls “andropause,” men’s hormones change, just as women’s do.
“The whole idea that men show hormonally based changes or change of life has not been studied much in this country, or has been seen as a joke, but in fact there is a lot of research on this happening outside the United States,” says Diamond, a Northern California psychotherapist who most recently published “Mr.
“But while there has been selection for conditional unfaithfulness, it’s also very possible that there was never selection of that sort — that estrus is a carry over from pre-pair-bonding, and has not been modified in the context of pair-bonding (for example, for infidelity).” But what about men? Men’s testosterone cycles fluctuate from higher in the morning to lower each evening, and, according to some Australian, Russian and Dutch studies, the hormone level fluctuates seasonally as well, peaking in October and ebbing in April, notes psychologist Jed Diamond, Ph D, author of several books on men and hormones.To illustrate: In one of his studies, men actually inched closer to a woman — and mimicked her gestures more — when she was ovulating.There are, of course, critics of this line of research, who believe that it’s overly focused on ovulation-related behavior, and that it doesn’t necessarily translate into what happens in real-world relationships.This much, however, is not debatable: Both men and women have little to no awareness of just how much these hormonal machinations in their bodies affect what they do.“The vast majority of all this occurs outside of our conscious awareness,” says Maner. You know when you have it, but you’re not sure what it is.” The real world notwithstanding, hormones certainly appear a formidable force in the lab.