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Select the details below that best describe this video. Lesbian dominatrix pornhub. Wallen also points out that previous research has shown that traits under strong selective pressure show little variability, while those under weak pressure tend to show more variability.

Lloyd and other proponents of the by-product theory agree that weak selection pressure could be acting on female orgasm, but not enough to maintain it over the eons of human evolution. If, at this point, you're as frustrated as me, you might be wondering what we do know about female orgasm. But sexperts are here to reassure us all that multiple orgasms really do exist and—even better—that we can all have them! Due to the inherent differences in orgasm between women and men, females were asked to report how often they had orgasms during sex and how difficult they were to achieve, while males were asked how long it took them to reach orgasm during the act and how often they felt they ejaculated too quickly or too slowly.

Ads by Traffic Junky. Girls having orgasms. So far, no selective force seems to appear. Ads are the worst, right? Obviously, we don't need to convince how great an orgasm is, but there are actually benefits beyond just pleasure. Zietsch says he doesn't have a favorite theory on the evolutionary function of female orgasm, but if forced to guess he'd say that it provides women extra reward for engaging in sex, thus increasing frequency of intercourse and, in turn, fertility. Male orgasms exist, it's widely believed, to encourage men to spread their seed.

Comment contains invalid characters. Preggo lesbian sex. Jennifer Abbasi is a science and health writer and editor living in Brooklyn. Back to back big Os. And once you reach your second, the doors are wide open: Comment cannot be longer than characters.

Your download will start in. Scientists agree that women probably started having orgasms as a by-product of men having them, similar to how men have nipples because women have them. The pair-bonding theory suggests that female orgasm bonds partners, ensuring two parents for the offspring, while mate selection offers that women use orgasm as a sort of litmus test for "quality" partners.

So, the question on all of our minds is, how?! Penis and vagina size — both necessary for reproduction -- show little variability, suggesting they are under strong selective pressure, Lloyd says, while clitoral length is highly variable. Next is learning to relax: Please login or register to add a video to collections. If you want to experience the thrills, give yourself permission to be the star of the sexual experience. Please enter your name. More work obviously needs to be done.

Focus on your breathing: If this holds up in future experiments, Lloyd says, it would establish that a woman's ability to have an orgasm during sex rests on an anatomical trait that likely varies with exposure to male sex hormones in the womb. Please try again later. Only one flag request every ten seconds is allowed.

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Focus on your breathing: Zietsch and Santtila found strong orgasmability correlations among same-sex identical twins, and weaker yet still significant similarities between same-sex non-identical twins and siblings.

Comment cannot be longer than characters. Mature naked couples pics. Wallen asserts that Zietsch and Santtila, "chose to compare apples to oranges because the evidence is so strong that men's and women's orgasms are under different degrees of selective pressure, the very point they were trying to disprove. Adblock users get a week free. If this holds up in future experiments, Lloyd says, it would establish that a woman's ability to have an orgasm during sex rests on an anatomical trait that likely varies with exposure to male sex hormones in the womb.

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All comments are moderated and may take up to 24 hours to be posted. Do these Pornstars appear in this video? Join Youporn Premium and never look back. All Categories Select all that apply. Lesbian tumblr themes. Girls having orgasms. There's a lot of variation even within individual women, and 10 percent of women never have them at all. Thank you for submitting your comment!

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If, at this point, you're as frustrated as me, you might be wondering what we do know about female orgasm. Zietsch says he doesn't have a favorite theory on the evolutionary function of female orgasm, but if forced to guess he'd say that it provides women extra reward for engaging in sex, thus increasing frequency of intercourse and, in turn, fertility.

Comment contains invalid characters. There may be few questions of human sexuality more rancorous than those about the female orgasm. Please enter a comment.

Sorry, could not submit your comment. Porn images of big tits. Wallen also points out that previous research has shown that traits under strong selective pressure show little variability, while those under weak pressure tend to show more variability. Kim Wallen, a behavioral neuroendocrinologist at Emory University and frequent collaborator with Lloyd, explains it thus:

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