Macho features have long been touted as an evolutionary asset that heterosexual women look for in a potential mate.
But new research suggests weight may be a more powerful driver of attraction. Macho features such as a strong jaw and squinty eyes advertise that a guy possesses high testosterone, according to the immunocompetence handicap hypothesis.
Since high levels of this masculinizing hormone interfere Do Hyattsville Maryland women like skinny men the immune system, the theory goes, macho men must be extra-fit to withstand the handicap their extra testosterone confers.
However, a new study finds that while women do respond more favorably to the faces and bodies of men with strong immune responses, they seem to cue into fatness Sexy black girls and miltf thinness, not macho featureswhen making their Mayland.
Fatness, or adiposity, "is an obvious choice for a marker of immunity because of its strong association with health and immunity," study researcher Vinet Maeyland, a postdoctoral scientist at the University of Pretoria in South Africa, told LiveScience. The trouble with the immunocompetence handicap hypothesis is that masculinity is not universally attractive to women, Coetzee and her colleagues wrote today Nov.
Nor have studies consistently linked macho features with good physical health.
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Weight is consistently linked both to health and immune system functioning, Coetzee said. Both overweight and underweight individuals are more likely to have health problems and poor immune function. To test the evolutionary role of fat, Coetzee and her colleagues first photographed 69 Caucasian male volunteers in underwear.
They also measured the men's body fat and testosterone levels. Hayttsville 65 percent were healthy weight, 4 percent were underweight and The men's immune system response was also measured with a blood test done before and after they received a vaccine for hepatitis B.U Are From Pa Ur Sister Lives Off Nixons Crossroads
Men with strong immune responses showed more antibody production after the vaccine than men with weak immune systems. Antibodies are the proteins that recognize and help neutralize foreign invaders in the body.
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Next, 29 heterosexual Latvian women looked at photographs of the men's faces and bodies separately and judged them on attractiveness. All of the women were in the fertile phases of their menstrual cycles, as judged by counting back from the last menstrual period to the day of Do Hyattsville Maryland women like skinny men ovulation.
A separate group of 20 heterosexual Finnish men and women rated the men for masculinity, and 14 other Latvian women rated the men's facial fatness, or adiposity, which is highly related to overall body fatness.
The results revealed Do Hyattsville Maryland women like skinny men fatness, as measured with facial adiposity, was linked to both antibody response and attractiveness, with pudgier men both having weaker immune systems and being seen as less appealing by the fertile women. A statistical analysis found that contrary to what the immunocompetence handicap would suggest, masculinity was not linked to either immune response or bodily or facial attractiveness.
Testosterone levels were also more closely linked with weight than with macho looks, Naughty woman wants casual sex Bradenton Beach researchers found.
Earlier research has found that skin toneanother sign of health, may also be more appealing to women than a macho face.
While the findings point away from a masculine jaw and toward chiseled abs as a sign of a good immune system, Coetzee warned that the study looked at just a single measure of immune response. The researchers also don't know if women had immune health in mind when they made their hot-or-not judgments.
The study, Coetzee said, "serves as a stepping stone for future studies that could test this relationship in different populations using alternative measures of immunity. Stephanie Pappas is a contributing writer for Live Science.
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She covers the world of human and animal behavior, as well as paleontology and other science topics. Stephanie has a Bachelor of Arts in psychology from the University of South Carolina and a graduate certificate in science communication from the University of California, Santa Cruz.Horny Moms Phone Numbers In Wyoming
She has ducked under a glacier in Switzerland and poked hot lava with a stick in Hawaii. Stephanie hails from East Tennessee, the global center for salamander diversity. Fit may matter more than macho in convincing women your genes are worth passing on, new research suggests.
Masculine health The trouble with the immunocompetence handicap hypothesis is that masculinity is not universally attractive to women, Coetzee and her colleagues wrote today Nov.
Stephanie Pappas, Live Science Contributor on. Science Newsletter: Most Popular.
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