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Penetration and Ejaculation

Penetration and Ejaculation. Penetration – insertion of the penis into the vagina Ejaculation: forceful expulsion of semen from the penis into the vagina. During intercourse/coitus-mechanical stimulation of the penis causes involuntary contractions that force semen out and into the vagina.

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Penetration and Ejaculation

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  1. Penetration and Ejaculation • Penetration – insertion of the penis into the vagina • Ejaculation: • forceful expulsion of semen from the penis into the vagina. • During intercourse/coitus-mechanical stimulation of the penis causes involuntary contractions that force semen out and into the vagina. • Urination is prevented by the closure of the bladder’s neck by sphincter.

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