ORGASM

Orgasm (from Greek οργασμός orgasmos, from organ to mature, swell, also sexual climax) is the sudden discharge of accumulated sexual tension during the sexual response cycle, resulting in rhythmic muscular contractions in the pelvic region characterized by an intense sensation of pleasure. Experienced by males and females, orgasms are controlled by the involuntary or autonomic nervous system. They are often associated with other involuntary actions, including muscular spasms in multiple areas of the body, a general euphoric sensation and, frequently, body movements and vocalizations are expressed. The period after orgasm (known as a refractory period) is often a relaxing experience, attributed to the release of the neurohormones oxytocin and prolactin.

Human orgasms usually result from the stimulation of the penis in males, typically accompanying ejaculation, and the clitoris in females. Stimulation can be by self-practice (masturbation) or by a partner (penetrative sexual intercourse, non-penetrative sex, and other erotic sexual activities). In addition, partners simultaneously stimulating each other's sex organs by mutual masturbation, penetrative intercourse, or other rhythmic inter-genital contact may experience simultaneous orgasms.

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MASTURBATION

Masturbation refers to the sexual stimulation of a person's genitals, usually to the point of orgasm. The stimulation can be performed manually, by use of objects or tools, or by some combination of these methods. Masturbation is a common form of autoeroticism, providing sexual pleasure or orgasm in the absence of a partner. The act, when performed with a partner, is called mutual masturbation and is sometimes used as an alternative to sexual intercourse.

Men and women have techniques and characteristics in common, but also have specific preferences in the ways they like to masturbate. Studies have found that masturbation is frequent in humans of both sexes and all ages, although there is variation. Various medical and psychological benefits have been attributed to a healthy attitude to sex in general and to masturbation in particular, and no causal relationship is known between masturbation and any form of mental or physical disorder. Acts of masturbation have been celebrated in art worldwide since prehistory. While there was a period (from the late 18th to the early 20th century) when it was subject to medical censure and social conservatism, it is considered a normal part of healthy life today. There have been masturbation marathons and health service slogans such as "an orgasm a day keeps the doctor away". It is commonly mentioned in popular music as well as on television, in films and in literature.

Animal masturbation has been observed in many species, both in the wild and in captivity.

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SEXUAL INTERCOURSE

Sexual intercourse, also known as copulation or coitus, commonly refers to the insertion of a male's penis into a female's vagina for the purposes of sexual pleasure or reproduction. The term may also describe other sexual penetrative acts, such as anal sex, oral sex and fingering, or use of a strap-on dildo, which can be practiced by heterosexual and homosexual pairings or more than two partners.

Sexual intercourse can play a strong role in human bonding, often being used solely for pleasure and leading to stronger emotional bonds. Non-penetrative sex (for example, non-penetrative cunnilingus) has been referred to as "outercourse", but may also be among the sexual acts contributing to human bonding and considered intercourse. The term sex can be taken to mean any mutual genital stimulation or to mean any form of sexual activity (i.e. all forms of intercourse and "outercourse"). Individuals can be at risk of contracting sexually transmitted diseases, and thus safe sex practices are advised.

In human societies, some jurisdictions have placed various restrictive laws against certain sexual activities such as gay sex, sex with minors, incest, extramarital sex, position-of-trust sex, prostitution, sodomy, public lewdness, polygamy and rape. Religious beliefs can play a role in decisions about sex, or its purpose, as well; for example, with virginity pledges. Some sections of Christianity commonly view sex between a married couple for the purpose of reproduction as holy, while other sections may not. Modern Judaism and Islam view sexual intercourse between husband and wife as a spiritual and edifying action. Hinduism and Buddhism views on sexuality have differing interpretations.

Sexual intercourse between non-human animals is more often referred to as copulation; for most, mating and copulation occurs at the point of estrus (the most fertile period of time in the female's reproductive cycle), which increases the chances of successful impregnation. However, bonobos, dolphins, and chimpanzees are known to engage in sexual intercourse even when the female is not in estrus, and to engage in sex acts with same-sex partners. Like humans engaging in sex primarily for pleasure, this behavior in the above mentioned animals is also presumed to be for pleasure, and a contributing factor to strengthening their social bonds.

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VAGINA

The vagina (from Latin vāgīna, literally "sheath" or "scabbard") is a fibromuscular tubular tract which is a sex organ and has two main functions; sexual intercourse and childbirth. In humans, this passage leads from the opening of the vulva to the uterus (womb), but the vaginal tract ends at the cervix. Unlike men, who have only one genital orifice, women have two, the urethra and the vagina. The vaginal opening is much larger than the urethral opening, and both openings are protected by the labia. The inner mould of the vagina has a foldy texture which can create friction for the penis during intercourse. During arousal, the vagina gets moist to facilitate the entrance of the penis.

The Latinate plural "vaginae" is rarely used in English. The word vagina is often used colloquially to refer to the vulva or to the female genitals in general; technically, the vagina is the specific internal structure.

 

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PENIS

The human penis is an external sexual organ of male humans. It is a reproductive, intromittent organ that additionally serves as the urinal duct.

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FEMALE REPRODUCTIVE SYSTEM

The human female reproductive system (or female genital system) contains two main parts: the uterus, which hosts the developing fetus, produces vaginal and uterine secretions, and passes the anatomically male person's sperm through to the fallopian tubes; and the ovaries, which produce the anatomically female person's egg cells. These parts are internal; the vagina meets the external organs at the vulva, which includes the labia, clitoris and urethra. The vagina is attached to the uterus through the cervix, while the uterus is attached to the ovaries via the Fallopian tubes. At certain intervals, the ovaries release an ovum, which passes through the Fallopian tube into the uterus.

If, in this transit, it meets with sperm, the sperm penetrate and merge with the egg, fertilizing it. The fertilization usually occurs in the oviducts, but can happen in the uterus itself. The zygote then implants itself in the wall of the uterus, where it begins the processes of embryogenesis and morphogenesis. When developed enough to survive outside the womb, the cervix dilates and contractions of the uterus propel the fetus through the birth canal, which is the vagina.

The ova are larger than sperm and have formed by the time an anatomically female person is born. Approximately every month, a process of oogenesis matures one ovum to be sent down the Fallopian tube attached to its ovary in anticipation of fertilization. If not fertilized, this egg is flushed out of the system through menstruation.

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MALE REPRODUCTIVE SYSTEM

The human male reproductive system (or male genital system) consists of a number of sex organs that are a part of the human reproductive process. In this type of reproductive system, these sex organs are located outside the body, around the pelvic region.
The main anatomically male sex organs are the penis and the testes which produce semen and sperm, which as part of sexual intercourse fertilize an ovum in an anatomically female person's body and the fertilized ovum (zygote) gradually develops into a fetus, which is later born as a child.

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