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Subjects identified the left-hand image as a woman and the right-hand one as a man. Yet the two images differ only in skin tone. Study by Richard Russell, Sinha Laboratory for Vision Research, MIT.   Skin color differs by sex: women are fairer and men browner and ruddier. Women also exhibit a greater contrast in... Read More
The female torso visibly reddens towards the end of the menstrual cycle. Do men unconsciously pick up on this visual cue? (Figure from Edwards and Duntley, 1949) Women vary in skin color over the menstrual cycle. From mid-cycle on, their skin steadily reddens because of an increase in blood flow that peaks in the day... Read More
Tanned arm (source). Underarm skin color used to be a reliable measure of constitutive pigmentation (skin color before tanning). Is it still? After puberty, girls become lighter-skinned than boys. This sexual differentiation has been shown to be hormonal in origin by a digit ratio study (Manning, Bundred, and Mather, 2004), by studies on normal, castrated,... Read More
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