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Physically attractive women don’t have higher levels of sex hormones, new study reveals

This contradicts a rather popular theory.

Mihai AndreibyMihai Andrei
October 26, 2018
in Mind & Brain, News, Science
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This deals a massive blow to a rather popular theory.

While physical attractiveness is something that’s prevalent and familiar in day-to-day life, it’s still something relatively understudied. Simply put, we’re only now starting to understand what makes some people attractive. For instance, many researchers have hypothesized that human attractiveness judgment is basically a psychological adaptation for identifying high-quality mates. Another popular hypothesis is that fertility, as indexed by high levels of the hormones estradiol and/or progesterone, is a particularly important aspect of women’s mate quality. Therefore, it makes a lot of sense to link the two together and assume that more attractive women would have higher levels of these hormones — or, so it would seem.

“Over the last few decades, there has been an enormous amount of work done on trying to understand why people find certain types of faces or certain body shapes particularly attractive,” said study author Benedict Jones (@ben_c_j) of the University of Glasgow and the Face Research Lab.

“One influential theory is that attractive women’s faces and body shapes are indicators of their hormone levels. The idea being that women with certain hormonal profiles (relatively high levels of estradiol and progesterone) are less likely to have problems conceiving and would therefore make good mates.”

But Jones and colleagues weren’t really convinced of that theory, so they tried to put it to the test.

“Although this controversial idea is a fundamental assumption of much of the work on human mate preferences, the evidence for it didn’t seem very convincing to us and was based on a handful of small studies that generally had very small sample sizes. So, we tried to replicate these assumed links between hormone levels and facial attractiveness and between hormone levels and body shape in a much larger sample,” Jones explained.

They recruited 249 female college students (average age 21), asking them for saliva samples and standardized facial photographs. The saliva was to measure hormone levels, while the photographs were used to assess their attractiveness — for science, of course. A few measurements of body metrics were also taken, and a separate group of volunteers were used to gauge their facial attractiveness.

Results showed that higher estradiol and progesterone levels were not associated with either facial attractiveness levels or hip-to-waist ratios. In fact, higher estradiol levels were associated with higher waist-to-hip ratios — which is the opposite of what the theory says.

While the sample size is quite small and there’s a case to be made for potential biases in rating attractiveness, this strongly suggests that women attractiveness is not really linked with their hormonal activity.

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“Although our data challenge this influential idea, we still don’t understand why some faces are judged more attractive than others. Some of our ongoing work hints that, rather than reflecting a person’s underlying physical qualities, attractiveness might be better understood as a byproduct of how easily we can process faces,” Jones concluded.

The study has been published in Psychoneuroendocrinology.

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Mihai Andrei

Mihai Andrei

Dr. Andrei Mihai is a geophysicist and founder of ZME Science. He has a Ph.D. in geophysics and archaeology and has completed courses from prestigious universities (with programs ranging from climate and astronomy to chemistry and geology). He is passionate about making research more accessible to everyone and communicating news and features to a broad audience.

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