NEW YORK —Why do most men prefer ladies with curvier bodies, especially sharp curvy hips? According to a study, modern man’s this preference has ancient evolutionary roots.
According to a research carried out by a team from the University of Texas (UT) at Austin and the UT – Arlington has found that for a mate, man preferred a woman with a “theoretically optimal angle of lumber curving,” a 45.5-degree bend from back to buttocks allowing ancestral women to better support, provide for, and carry out multiple pregnancies.
“The findings enable us to conclusively show that men prefer women who exhibit specific angles of spinal bend over buttock mass,” said study’s co-author Eric Russell from the UT – Arlington in a paper published in the journal Evolution and Human Behavior.
This investigation consisted of two studies. The first looked at vertebral wedging, an underlying spinal feature that can influence the actual curve in women’s lower backs.
Around 100 men rated the attractiveness of several manipulated images showing spinal curves ranging across the natural spectrum.
Men were most attracted to images of women displaying the hypothesized optimum of 45 degrees of lumbar curvature.
This adds growing body of evidence that beauty is not entirely arbitrary or “according to the viewer” as many in mainstream social sciences believed, but instead has a coherent adaptive logic, added psychology professor David Buss from the UT Austin.
“This spinal structure would have enabled pregnant women to adjust their weight over the hips,” the authors noted.
These women would have been more effective at foraging during pregnancy and less likely to suffer spinal injuries.
Thus, men who preferred these women would have had mates who were better able to provide for foetus and offspring, and who would have been the able to carry out multiple pregnancies without injury.
The second study addressed the topic of whether men prefer this angle because it reflects bigger buttocks, or whether it truly can be attributed to the angle in the spine itself.
Around 200 men were presented with groups of images of women with differing buttock size and vertebral wedging, but maintaining a 45.5-degree curve.
Men consistently preferred women whose spinal curvature was closer to optimum regardless of buttock size.
New vaginal ring to prevent HIV, pregnancy is safe: Study
An experimental vaginal ring designed to prevent pregnancy and HIV looks safe, according to an early stage study.
The ring is designed to provide 90 days’ protection at a time. The dual-purpose ring releases the antiretroviral drug dapivirine and the contraceptive hormone levonorgestrel, said researchers led by Dr Sharon Achilles, of the University of Pittsburgh School of Medicine.
This small, 14-day trial involving 24 women who were not pregnant and not infected with HIV was the first clinical study of the ring.
“We are very encouraged by our findings in this first-in-human study of the dapivirine-levonorgestrel ring,” said Achilles, an assistant professor of obstetrics, gynecology and reproductive sciences.
Its use resulted in sufficient levels of levonorgestrel to prevent pregnancy and adequate levels of dapivirine to reduce risk of HIV infection, the researchers noted.
There were no safety concerns, and the ring was well-tolerated, according to the Microbicide Trials Network study.
The researchers have started a second Phase 1 trial in which women will use the ring for 90 days.
“With a second study underway, we are another step closer to potentially having an easy-to-use product that can provide safe and effective, long-acting protection against both HIV and unintended pregnancy,” Achilles said in a network news release.
The research was funded by the US National Institutes of Health and presented Wednesday (Oct 24) at an HIV prevention conference, in Madrid, Spain.
Research presented at meetings is usually considered preliminary until published in a peer-reviewed medical journal.