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Contact with dads drops when women ovulate
Date:11/29/2010

are perceived as more attractive by men, and to contemplate more frequently the possibility of straying from their mates during high as opposed to low fertility periods of their menstrual cycle. Research has also shown that women are more attracted during high-fertility periods to men whose physique and behavior are consistent with virility, especially if they're not already mated to men with these characteristics.

For the latest study, the researchers examined the cell phone records of 48 women between the ages of 18 and 22 or near the height of a woman's reproductive years. Over the course of one cell phone billing period, the researchers noted the date and duration of calls with two different people: the subjects' fathers and their mothers. They then identified the span of days comprising each woman's high and low fertility days within that billing period.

Women were about half as likely to call their fathers during the high fertility days of their cycle as they were to call them during low fertility days. Women's fertility had no impact, however, on the likelihood of their fathers calling them. Women also talked to their fathers for less time at high fertility, regardless of who initiated the call, talking only an average of 1.7 minutes per day at high fertility compared to 3.4 minutes per day at low fertility.

The researchers concede that the high-fertile women might simply be avoiding their fathers because fathers might be keeping too close an eye on potential male suitors. But their data cast some doubt on this possibility. It is more likely, they conclude, that like females in other species, women have built-in psychological mechanisms that help protect against the risk of producing less healthy children, which tends to occur when close genetic relatives mate.

"In humans, women are only fertile for a short window of time within their menstrual cycle," Lieberman said. "Sexual decisions during this time are cri
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Contact: Meg Sullivan
msullivan@support.ucla.edu
310-825-1046
University of California - Los Angeles
Source:Eurekalert

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