In mammals , the vagina is the elastic, muscular part of the female genital tract. In humans, it extends from the vulva to the cervix. The outer vaginal opening is normally partly covered by a membrane called the hymen. At the deep end, the cervix neck of the uterus bulges into the vagina. The vagina allows for sexual intercourse and birth. It also channels menstrual flow menses , which occurs in humans and closely related primates as part of the monthly menstrual cycle. Although research on the vagina is especially lacking for different animals, its location, structure and size are documented as varying among species. Female mammals usually have two external openings in the vulva, the urethral opening for the urinary tract and the vaginal opening for the genital tract. This is different from male mammals, who usually have a single urethral opening for both urination and reproduction.

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Your email address is used to log in and will not be shared or sold. Read our privacy policy. If you are a Zinio, Nook, Kindle, Apple, or Google Play subscriber, you can enter your website access code to gain subscriber access. Your website access code is located in the upper right corner of the Table of Contents page of your digital edition. Sign up for our email newsletter for the latest science news. The foot is an erotic symbol, variably appreciated by different people [1]. Erotic thoughts and feelings about feet may become intentionally accentuated by fashion and the wearing of shoes with high heels, providing a position of the foot that resembles its position during female orgasm when feet and toes may automatically go into plantar flexion resulting in arching of the foot and curling of the toes [1, 2]. Currently, the association of feet with sexual attraction and eroticism has been explained in terms of psychology and sociology [1].
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By Cassie Murdoch and Kaitlyn Kelly. They make it look effortless, but even they occasionally fall face first. So just think how risky heels can be for the untrained commoner. A Vocativ analysis found that hundreds of women and even a few men are injured every year in high-heel related accidents. To determine just how much trouble those Manolos can get you in, we looked at data from the Consumer Product Safety Commission which tracks product-related injuries in the U. We looked at every incident from until that involved high heels, and the results were enough to make you swear off those Jimmy Choos for life. During that six year period, 2, people total suffered heels-related injuries. Women accounted for 2, of those, but even men managed to stumble in with 66 total injuries. As one might expect, adult women were the most common victims. Their injuries ranged from the minor twisted ankles to the very painful broken feet and legs , and they mostly seemed to come from trying to walk through the world while teetering around with several extra inches of height.
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