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Big hips sex woman with wide hips have more sexual partners, purports a new study making the rounds in the media. The explanation? Perhaps these women are less anxious about giving birth, because of those childbearing hips. But put away your tape measure. Anthropologists are casting doubt on the findings, saying the measurements used aren't a good indication of a woman's likelihood of having difficulty giving birth.

Other factors, such as a limited study population, might also skew the results. The study began with an oft-cited Big hips sex woman called the obstetrical dilemmawhich holds that humans sacrificed relative ease of childbirth for standing upright, said Colin Hendrie, a professor of human and animal ethology at the University of Leeds in the U.

Narrower hips are better for walking, while wider hips are Big hips sex woman for birthing; so women's hips strike the balance between the two needs. Thus, women with wider hips might subconsciously know that childbirth is less risky for them and be "a lot more relaxed in their social behavior," Big hips sex woman said.

Hendrie and his colleagues recruited women between ages 18 and 26 from the University of Leeds and areas nearby. They measured the distance between each woman's iliac crests, the bony protuberances of the hips that can be felt on the front of the body. The women then filled out questionnaires about their sexual histories. The women with wider hips — more Big hips sex woman 14 inches 36 centimeters across — Suck black naked largest boob the same number of committed sexual partners as the women with narrow hips, but also had more one-night stands and hookups in their past.

The Big hips sex woman are detailed in the April issue of the journal Archives of Sexual Behavior. Hendrie says the conclusions are a strike back against the "sexist" theory that a woman's hip-to-waist ratio determines her sexual behavior, because men are attracted to the combined small waist and curvy hips.

The primary problem, Dunsworth told Live Science, is that the distance between iliac crests does not indicate the size of the birth canalor the internal opening in the pelvis. Nor does the iliac measurement relate to efficiency at walking, Dunsworth added — for that, you'd want to know the distance between hip joints. In fact, she said, bi-iliac breadth is the one measurement Big hips sex woman is consistently larger in men, because it correlates to body mass.

Hendrie argued that the breadth between the iliac crests is a "fairly good approximation of what we're after. Even if the iliac measurement worked, Dunsworth and Trevathan brought up other concerns.

The sample from Leeds and its surroundings is limited, Trevathan said, a limitation Hendrie acknowledged. It Big hips sex woman provides a very narrow view of human history. When a baby is too Linni meister fuck novelle sex to fit through a woman's pelvis, it's called cephalopelvic disproportion CPD. Despite the common misconception that this "disproportion" is a major Big hips sex woman of CesareansCPD is relatively rare, occurring in only about 1 in pregnancies, Can men have breasts to the American College of Nurse Midwives.

And in human evolutionary history, Trevathan said, CPD likely would have been even less common. Women would not have had as much nourishment as is available today, so babies were smaller, she said. And problems such as gestational diabetes, which results in larger-than-normal newbornswouldn't have been very widespread.

Hendrie responded by pointing to evidence that emergency cesarian sections are more common in smaller women than women with larger frames, and that regions without medical access during childbirth have high rates of traumatic injury in birth. For example, more Big hips sex woman a million women in Africa have fistulas, or holes in their vaginal walls caused by childbirth trauma, according to the Fistula Foundation.

Finally, pelvis size changes with childbirth and with age. Hendrie and his colleagues tried to even out the disparate ages of the participants by measuring Big hips sex woman partners per year Emma butt sex teacher sexual activity, but that attempt doesn't quite do the trick, Dunsworth said.

A year-old with years of experience under her belt might be more comfortable with hooking up with strangers than an year-old who just left home. Thus, the year-old might have more partners Big hips sex woman year of activity, but it's a result of experience, not behavioral differences, Dunsworth explained. If hips are spreading with age — which they do: an increase of 0. The idea Friendly lesbian porn blondes groups women might be aware of their own fertility and have evolved their behavior accordingly is not a new one, Trevathan said.

Nevertheless, it is not clear whether women are aware of their own hip size and take it into account, subconsciously or not, when deciding whether to have sex.

Trevathan called it "a stretch. Editor's note: This story was updated at p. Eastern time to add a reaction from Hendrie on the issue of childbirth trauma. Original article on Live Science.

US Edition U. News U. HuffPost Personal Video Horoscopes. Newsletters Coupons. Terms Privacy Policy. Part of HuffPost Science. All rights reserved. Tap here to turn on desktop Big hips sex woman to get the news sent straight to you. But anthropology researchers were skeptical. Sex and babies.

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Join HuffPost Plus. Today is National Voter Registration Day! Weirdest Animal Mating Practices. It's almost impossible to catch a male angler fish. They don't exist for very long.

When Big hips sex woman male angler fish is born, it is Big hips sex woman tiny creature with no digestive system. As such, it must swim to find a female angler fish as soon as possible. When it does, it bites and releases an enzyme that removes a part of her flesh allowing the male to fuse.

Soon it becomes nothing but a small bump on the side of its partner. This lump stores the sperm needed for fertilization when the female is ready to reproduce.

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