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Thus, sperm must somehow use their limited resources to maintain their fertility in the face of numerous impediments. On the other hand, with their unaltered partners, the reverse was true, they were less likely to 'want to get it over with' and considerably more likely to 'really get into it. Fallopian tubespermatozoauterine tubeuterusvagina. Br J Urol ; Lessons for assisted conception. When the penile shaft is withdrawn slightly from the vagina, the foreskin bunches up behind the corona in a manner that allows the tip of the foreskin which contains the highest density of fine-touch neuroreceptors in the penis [ 1 ] to contact the corona of the glans which has the highest concentration of fine-touch receptors on the glans [ 18 ].

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Results for : insemination

Myometrial contractions may be stimulated by seminal components. The findings cannot be completely attributed to selection bias. Conversely, women were more likely to have a vaginal orgasm with an unaltered partner. The fate of spermatozoa that are ejaculated or inseminated into the vagina, but that do not enter the cervix, has not been studied extensively in humans. Nevertheless, the chemotactic agent in follicular fluid has not been identified, nor has its presence in the Fallopian tube been detected. Why the presence of the foreskin enhances intimacy needs further exploration.

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