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Yes, your vagina is a self-cleaning oven! A change in smell or an odor after sex can be a symptom of a medical condition; a visit to your doctor or nurse practitioner is in order. Questions were submitted by readers and answered by New York Times experts.

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Sperm are single-purposed: They're optimized to get to an egg and inseminate it. But that doesn't mean there isn't more to this cell than meets the ovum. Sperm, along with its travelling companion, semen, are surprisingly versatile and adaptable substances.

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Six months previously, he impregnated a woman in a lesbian relationship, whose partner believed the sperm was inserted artificially. Having initially interviewed Terry and Tim while researching a feature for LondonistI went on to speak to a dozen more would-be natural inseminators in the course of an undercover investigation for Cosmopolitan. Out of all the men whose ads I answer, Tim turns out to be the only one who has thought about the consequences.

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Illustrations by Heather Benjamin. All illustrations by Heather Benjamin. It was true; I kissed her and my semen tasted like fruit juice. During the previous few days, I had eaten pineapple and berries for lunch and was drinking more juice than usual.

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In rare cases, people have been known to have allergic reactions to proteins in their partner's semen semen allergy. Semen allergy isn't a direct cause of infertility. Signs and symptoms of semen allergy include redness, burning and swelling where the semen has contacted the skin, usually in the outer genital area.

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In the context of sexual reproduction, natural selection is generally thought of as a pre-copulation mechanism. We are drawn to features of the human body that tell us our partner is healthy and will provide us a fighting opportunity to carry on our genetic lineage. But a new article appearing in the February issue of Current Directions in Psychological Science suggests that the human male has evolved mechanisms to pass on his genes during post-copulation as well, a phenomenon dubbed "sperm competition.

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Here's how to inoculate ourselves against negative ones. Verified by Psychology Today. As You Like It.

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Artificial insemination AI is the deliberate introduction of sperm into a female's cervix or uterine cavity for the purpose of achieving a pregnancy through in vivo fertilization by means other than sexual intercourse. It is a fertility treatment for humans, and is common practice in animal breedingincluding dairy cattle see Frozen bovine semen and pigs. Artificial insemination may employ assisted reproductive technologysperm donation and animal husbandry techniques.

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Sperm competition is a form of post-copulatory sexual selection [1] whereby male ejaculates simultaneously physically compete to fertilize a single ovum. Physiological evidence, including testis size relative to body weight and the volume of sperm in ejaculations, suggests that humans have experienced a low-to-intermediate level of selection pressure for sperm competition in our evolutionary history. Evidence suggests that, among the great apes, relative testis size is associated with the breeding system of each primate species.

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Readers share their struggles and successes with conceiving kids. To share your own story, please send us a note: hello theatlantic. The stories seem to be consistently from heterosexual relationships, and while I can relate to these on some level infertility, financial strain, marriageI am at the same time seeing them at such a distance. My experiences are not the same and I have many of the same options, but they are altogether different.

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