What age does a girls hips widen?

25-30 years With the onset of puberty, the male pelvis remains on the same developmental trajectory, while the female pelvis develops in an entirely new direction, becoming wider and reaching its full width around the age of 25-30 years. From the age of 40 onward, the female pelvis then begins to narrow again.

sciencedaily.com - Female pelvis adjusts for childbearing years - ScienceDaily

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Women have wider hips than men because their pelves must allow for the birth of large-brained babies. Nevertheless, many female pelves are still not wide enough, which can result in difficult births. Traditionally, the human pelvis has been considered an evolutionary compromise between birthing and walking upright; a wider pelvis would compromise efficient bipedal locomotion. But this hypothesis has now been called into question: According to new studies, wide hips do not reduce locomotor efficiency. A team of researchers led by Marcia Ponce de León at the Anthropological Institute of the University of Zurich has gained new insights. Using computed tomographic data, they tracked pelvic development from birth to old age and found that until puberty, male and female pelves are similar in width. With the onset of puberty, the male pelvis remains on the same developmental trajectory, while the female pelvis develops in an entirely new direction, becoming wider and reaching its full width around the age of 25-30 years. From the age of 40 onward, the female pelvis then begins to narrow again.

Difficult Childbirths Are Not an Evolutionary Problem

The researchers hypothesize that these processes are steered by changes in hormone levels. With the onset of puberty, estrogen concentration reaches high levels, which are maintained until menopause. High estrogen levels thus maintain high fertility and also guarantee that the female pelvis develops and maintains its obstetrically most favorable form. "This implies that the female body can modulate its pelvic dimensions 'on demand', and is not dependent on genetically fixed developmental programs," explains Ponce de León. At the same time, hormone levels also depend on environmental and nutritional factors. "This suggests that difficult childbirths are not necessarily an evolutionary mis-step, but more a question of the balance between the hormones and the external factors influencing the size of the birth canal and the prenatal development of the child." But why does the female pelvis contract again with the onset of menopause? The researchers assume that a narrow pelvis is better suited to stabilizing the pelvic floor and thus to withstanding the high pressures that are generated in the abdomen during bipedal walking. As such, men and women become more similar from the age of 40 -- at least as far as their pelves are concerned.

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What color turns a man on?

Studies reveal that red is the most attractive colour to both men and women but, curiously, the two genders are attracted to the same colour for different reasons.

nzherald.co.nz - Scientists reveal the colour that makes you more attractive - NZ Herald

Scientists have revealed that wearing the colour red will make you more attractive to the opposite sex. Studies reveal that red is the most attractive colour to both men and women but, curiously, the two genders are attracted to the same colour for different reasons. Women are attracted to men wearing red because, according to one study, it sends signals of status and dominance. "We found that women view men in red as higher in status, more likely to make money and more likely to climb the social ladder," study co-author Professor Andrew Elliot said.

"And it's this high-status judgment that leads to the attraction."

Men, on the other hand, are attracted to women who wear red for more primal biological reasons, a separate study found. "Our research demonstrates a parallel in the way that human and nonhuman male primates respond to red," the study's authors wrote. "In doing so, our findings confirm what many women have long suspected and claimed – that men act like animals in the sexual realm. "As much as men might like to think that they respond to women in a thoughtful, sophisticated manner, it appears that at least to some degree, their preferences and predilections are, in a word, primitive." The two studies were published in the Journal of Personality and Social Psychology and the Journal of Experimental Psychology: General.

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