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Sexual stimulation

Sexual intercoursespecifically coitusis the human form of copulation. The term sexual intercourse refers to a wider range of sexual activities than the term coituswhich only refers to male-female genital sex. See Human sexual behavior for a discussion of the broader sense of sexual intercourse and list of sexual positions for the wide variety of sexual activities that exist.

See the terms frot for male-male genital sex and tribadism for female-female genital sex. Coitus may be preceded by foreplaywhich leads to sexual arousal of the partners, resulting in the erection of the penis and natural lubrication of the vagina. To engage in sexual intercourse, the erect penis is inserted into the vagina and one or both of the partners move their hips to move the penis backward and forward inside the vagina to cause frictionwithout ever fully removing the penis.

In this way, they stimulate themselves and each other until orgasm and ejaculation are achieved.

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Penetration with the penis is also known as intromission, or by the Latin name immissio penis. A detailed description of the physiology of sexual arousal and orgasm can be found in the article Human sexual response cycle. Coitus is the basic reproductive method of humans. During ejaculation, which sex accompanies male orgasm, a series of same contractions delivers semen containing male gametes known as sperm cells or spermatozoa into the vault of the vagina. The subsequent route of the intercourse from the vault of the vagina, is through the cervix and into the uterusand then into the fallopian tubes.

Millions gif sperm poto anal sex indonesia present in each ejaculation, to increase the chances of one fertilizing an egg or ovum.