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on the internet. lahoreescorts.info is a porn site that has the best xxx homemade porn. Shy girl couldnt handle destructive backshots from rough black guy. Enter the most read porn review site! Rabbits porn reviews examines the best porn sites. Read honest porn site reviews! Black Tgirls. $ 30 days. Human sexuality is the way people experience and express themselves sexually. This involves From Wikipedia, the free encyclopedia . a stable, committed relationship such as marriage) and should also be more promiscuous The “ black letter” approach to law focuses on the study of pre-existing legal precedent, .

It consists of two main zones: The Cowper's glands, or bulbourethral glands, are two pea sized structures beneath the prostate. Female anatomy and reproductive system[ edit ] External female anatomy[ edit ] External female genitals depilated.

The mons veneris, also known as the Mound of Venusis a soft layer of fatty tissue overlaying the pubic bone. It has many nerve endings and is sensitive to stimulation.

The labia majora are two elongated folds of skin extending from the mons to the perineum. Its outer surface becomes covered with hair after puberty. In between the labia majora are the labia minora, two hairless folds of skin that meet above the clitoris to form the clitoral hood, which is highly sensitive to touch. The labia minora become engorged with blood during sexual stimulation, causing them to swell and turn red.

Near the anus, the labia minora merge with the labia majora. It is the main source of orgasm in women. These opening have many nerve endings that make them sensitive to touch. They are surrounded by a ring of sphincter muscles called the bulbocavernosus muscle.

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Underneath this muscle and on opposite sides of the vaginal opening are the vestibular bulbs, which help the vagina grip the penis by swelling with blood during arousal.

Within the vaginal opening is the hymena thin membrane that partially covers the opening in many virgins. Rupture of the hymen has been historically considered the loss of one's virginity, though by modern standards, loss of virginity is considered to be the first sexual intercourse. The hymen can be ruptured by activities other than sexual intercourse.

The urethral opening connects to the bladder with the urethra; it expels urine from the bladder. This is located below the clitoris and above the vaginal opening. Western culture is one of the few in which they are considered erotic. Breasts develop during puberty in response to an increase in estrogen. Each adult breast consists of 15 to 20 milk-producing mammary glandsirregularly shaped lobes that include alveolar glands and a lactiferous duct leading to the nipple.

The lobes are separated by dense connective tissues that support the glands and attach them to the tissues on the underlying pectoral muscles.

Female reproductive system The female reproductive system. The vagina is a sheath-like canal that extends from the vulva to the cervix. It receives the penis during intercourse and serves as a depository for sperm. The vagina is located between the bladder and the rectum.

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The vagina is normally collapsed, but during sexual arousal it opens, lengthens, and produces lubrication to allow the insertion of the penis. The vagina has three layered walls; it is a self-cleaning organ with natural bacteria that suppress the production of yeast. This area may vary in size and location between women; in some it may be absent. Various researchers dispute its structure or existence, or regard it as an extension of the clitoris.

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During ovulation, this thickens for implantation. If implantation does not occur, it is sloughed off during menstruation.

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The cervix is the narrow end of the uterus. The broad part of the uterus is the fundus. Finger-like projections at the ends of the tubes brush the ovaries and receive the ovum once it is released. The ovum then travels for three to four days to the uterus.

The lining of the tube and its secretions sustain the egg and the sperm, encouraging fertilization and nourishing the ovum until it reaches the uterus. If the ovum divides after fertilization, identical twins are produced.

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If separate eggs are fertilized by different sperm, the mother gives birth to non-identical or fraternal twins. The ovaries are suspended by ligaments and are the source where ova are stored and developed before ovulation. The ovaries also produce female hormones progesterone and estrogen. Within the ovaries, each ovum is surrounded by other cells and contained within a capsule called a primary follicle.

At puberty, one or more of these follicles are stimulated to mature on a monthly basis. Once matured, these are called Graafian follicles. On days one to four, menstruation and production of estrogen and progesterone decreases, and the endometrium starts thinning. The endometrium is sloughed off for the next three to six days.

Once menstruation ends, the cycle begins again with an FSH surge from the pituitary gland. Days five to thirteen are known as the pre-ovulatory stage. During this stage, the pituitary gland secretes follicle-stimulating hormone FSH. A negative feedback loop is enacted when estrogen is secreted to inhibit the release of FSH. Estrogen thickens the endometrium of the uterus. A surge of Luteinizing Hormone LH triggers ovulation.

On day 14, the LH surge causes a Graafian follicle to surface the ovary. The follicle ruptures and the ripe ovum is expelled into the abdominal cavity. The fallopian tubes pick up the ovum with the fimbria. The cervical mucus changes to aid the movement of sperm.

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On days 15 to 28—the post-ovulatory stage, the Graafian follicle—now called the corpus luteum —secretes estrogen. Production of progesterone increases, inhibiting LH release. The endometrium thickens to prepare for implantation, and the ovum travels down the Fallopian tubes to the uterus.

If the ovum is not fertilized and does not implant, menstruation begins.

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This model was created by William Masters and Virginia Johnson. According to Masters and Johnson, the human sexual response cycle consists of four phases; excitement, plateau, orgasm, and resolution, also called the EPOR model.

During the excitement phase of the EPOR model, one attains the intrinsic motivation to have sex. The plateau phase is the precursor to orgasm, which may be mostly biological for men and mostly psychological for women.

Orgasm is the release of tension, and the resolution period is the unaroused state before the cycle begins again.

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Vasoconstriction in the penis begins, the heart rate increases, the scrotum thickens, the spermatic cord shortens, and the testicles become engorged with blood.

In the plateau phase, the penis increases in diameter, the testicles become more engorged, and the Cowper's glands secrete pre-seminal fluid. The orgasm phase, during which rhythmic contractions occur every 0. Ejaculation is called the expulsion phase; it cannot be reached without an orgasm. In the resolution phase, the male is now in an unaroused state consisting of a refactory rest period before the cycle can begin.

This rest period may increase with age. Characteristics of this phase include increased heart and respiratory rate, and an elevation of blood pressure. Flushed skin or blotches of redness may occur on the chest and back; breasts increase slightly in size and nipples may become hardened and erect.

The onset of vasocongestion results in swelling of the clitoris, labia minora, and vagina. The muscle that surrounds the vaginal opening tightens and the uterus elevates and grows in size. The vaginal walls begin to produce a lubricating liquid.

The second phase, called the plateau phase, is characterized primarily by the intensification of the changes begun during the excitement phase. The plateau phase extends to the brink of orgasm, which initiates the resolution stage; the reversal of the changes begun during the excitement phase. During the orgasm stage the heart rate, blood pressure, muscle tension, and breathing rates peak.

The pelvic muscle near the vagina, the anal sphincter, and the uterus contract. Muscle contractions in the vaginal area create a high level of pleasure, though all orgasms are centered in the clitoris. These changes induce a "difference between the stereotyped sexual behaviors in non-human mammals and the astounding variety of human sexual behaviors". In particular, lordosis behavior, which is a motor reflex complex and essential to carry out copulation in non-primate mammals rodentscaninesbovids Sexual stimuli on women do not trigger any more neither immobilization nor the reflex position of lordosis.

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