O.R.G.A.S.M.

From my girl friend experience, she told me that she knows when it comes; While the whole process, you will understand and notice that there is a different feeling from your virgina, and transform your mood to a different level, and you may have to scream with different tone, or move harmonicly with your partner more rapidly.........no one will feel the same...so cannot tell you exactly what it is and how YOU feel........
All these happen in your mind and you should notice it.

Sexual intercourse, specifically coitus, is the human form of copulation. The term sexual intercourse refers to a wider range of sexual activities than the term coitus, which 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. "Genital sex" as used here refers to genito-genital sex, among BDSM/fetish practitioners the term "genital sex" can mean any sex involving the genitals including anal, oral, manual, etc., as opposed to those based on toys, costumes or fantasies.

Coitus may be preceded by foreplay, which 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 friction, typically without fully removing the penis. In this way, they stimulate themselves and each other until orgasm and ejaculation are achieved. 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.

Contents
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1 Sexual reproduction
2 Functions of sex beyond reproduction
3 Sexual drive
4 Sexual-intercourse difficulties
5 Sexual morality and legality
6 See also
7 Notes
8 External links


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Sexual reproduction


The "doggy style" position.
Coitus is the basic reproductive method of humans. During ejaculation, which normally accompanies male orgasm, a series of muscular contractions delivers semen containing male gametes known as sperm cells or spermatozoa into the vault of the vagina. The subsequent route of the sperm from the vault of the vagina, is through the cervix and into the uterus, and then into the fallopian tubes. Millions of sperm are present in each ejaculation, to increase the chances of one fertilizing an egg or ovum. When a fertile ovum from the female is present in the fallopian tubes, the male gamete joins with the ovum resulting in fertilization and the formation of a new embryo. When a fertilized ovum reaches the uterus, it becomes implanted in the lining of the uterus, known as endometrium and a pregnancy begins.

Heterosexual intercourse (coitus), where both participants are believed to be fertile, should always be considered likely to result in pregnancy, unless adequate contraceptive (birth control) measures are taken.

ORGASM直釋是極度興奮,但又釋作口交,一般美國的四仔會甘用

extremely high