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Diagrams of penis penetration during intercourse

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Contributors: WWS initiated and coordinated the formulation of the study hypothesis, designed the protocol, and participated in data collection, interpretation of the findings, and writing of the paper; he is guarantor of the study. PvA had the original idea for the present study, and participated in formulation of the study hypothesis, data collection, interpretation of the findings, and writing of the paper. IS, together with her partner, participated in the first two experiments and helped design the protocol. EM participated in the execution of the study, particularly data collection and interpretation of the magnetic resonance findings.
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Category:Penile-vaginal intercourse

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Sexual penetration - Wikipedia

Sexual intercourse , also called coitus , or copulation , reproductive act in which the male reproductive organ in humans and other higher animals enters the female reproductive tract. If the reproductive act is complete, sperm cells are passed from the male body into the female, in the process fertilizing the female egg and forming a new organism. In some vertebrates, such as fish , eggs are laid outside of the body and fertilized externally. To accomplish internal copulation certain body and organic adaptations are necessary.
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Anatomy of the Penis, Mechanics of Intercourse

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Sexual penetration is the insertion of a body part or other object into a body orifice , such as the vagina , anus or mouth , as part of human sexual activity or animal sexual behavior. The term is most commonly used in statute law in the context of proscribing certain sexual activities. Terms such as " sexual intercourse " or " carnal knowledge " are more commonly found in older statutes, while many modern criminal statutes use the term "sexual penetration" because it is a broad term encompassing unless otherwise qualified any form of penetrative sex, including digital meaning with the digits, i.
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