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Emma Kaywin, a Brooklyn-based sexual health writer and activist, is here to calm your nerves and answer your questions. No gender, sexual orientation, or question is off limits, and all questions will remain anonymous. Please send your questions to tips bustle.

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All videos Pornstars Categories. Our network. Sperm - 26, Videos Popular Latest Longest.

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Suarez, A. At coitus, human sperm are deposited into the anterior vagina, where, to avoid vaginal acid and immune responses, they quickly contact cervical mucus and enter the cervix. Cervical mucus filters out sperm with poor morphology and motility and as such only a minority of ejaculated sperm actually enter the cervix.

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Men and women experience similar physiological changes during orgasmthe climax of sexual intercourse. It typically lasts less than a minute [source: Discover ]. In both sexes, the rectum contracts at intervals of approximately 0. And then of course there's the laundry list of pleasure chemicals, like oxytocinnorepinephrine and serotonin, that saturate the brain like a flash flood of indescribable joy.

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It is usually a white or yellowish, sticky substance made up of sperm male cells for sexual reproduction floating in a fluid called seminal plasma that has water and different chemicals in it. Normally, an ejaculation makes between 1. Some scientists think that semen that is taken into a woman's body causes her not to feel depressed or sad.

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There are approximately million sperm in each human ejaculation, but only about 2 million sperm make it into the cervix. Out of the approximately 2 million sperm entering the cervix, only about 1 million make it into the uterus. The rest are stopped by gooey mucus, or swim into dead-end channels inside the walls of the cervix.

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So Far. Who's the Queen of Comics? Hint: Not Wonder Woman. Earlier this week, I wrote about the possible antidepressant effects of semen in women.

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Human female orgasm is a vexed question in the field while there is credible evidence of cryptic female choice that has many hallmarks of orgasm in other species. Our initial goal was to produce a proof of concept for allowing females to study an aspect of infertility in a home setting, specifically by aligning the study of human infertility and increased fertility with the study of other mammalian fertility. In the latter case - the realm of oxytocin-mediated sperm retention mechanisms seems to be at work in terms of ultimate function differential sperm retention while the proximate function rapid transport or cervical tenting remains unresolved.

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A sperm's quest to fertilize an egg is not easy. Of the roughly million sperm ejaculated into the human vagina during intercourse, fewer than one in a hundred will survive the perilous trek up the hostile, acidic chamber to the cervix. If the female is set to ovulate soon, the cervix will allow the frisky, foreign interlopers inside.

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