Penetration and intromission

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Sexual intercourse or coitus or copulation is sexual activity typically involving the insertion and thrusting of the penis into the vagina for sexual pleasure , reproduction , or both. There are different views on what constitutes sexual intercourse or other sexual activity , which can impact on views on sexual health. Various jurisdictions place restrictions on certain sexual acts, such as incest , sexual activity with minors , prostitution , rape , zoophilia , sodomy , premarital and extramarital sex. Religious beliefs also play a role in personal decisions about sexual intercourse or other sexual activity, such as decisions about virginity , [13] [14] or legal and public policy matters.
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Magnetic resonance imaging of male and female genitals during coitus and female sexual arousal

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Sexual intercourse - Wikipedia

Inappropriate intromission time causes sexual problems for couples, and therefore it is important for the couple to set treatment targets. We investigated appropriate intromission times by conducting a questionnaire survey of the interval from initiation of insertion to just before ejaculation in Japanese married couples. A questionnaire survey of married couples was conducted by mail. The estimated mean intromission times were The mean desired intromission time for female subjects was Regarding the difference between the actual and desired intromission times, the desired time was longer, the same, and shorter for It seems that female subjects may consider a wide variety of intravaginal insertion times to be desirable.
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Sexual intercourse

Vaginismus is the involuntary tensing or contracting of muscles around the vagina. The vagina is part of the female reproductive system. It connects the lower part of the uterus cervix to the outside of the body. These unintentional muscle spasms occur when something — a penis, finger, tampon or medical instrument — attempts to penetrate the vagina. The spasms may be mildly uncomfortable or very painful.
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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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