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The mechanics of human sexuality or mechanics of sex, or more formally the biomechanics of human sexuality, is the study of the mechanics related to human sexual activity. Examples of topics include the biomechanical study of the strength of vaginal tissuesand the biomechanics of male erectile function. The mechanics of sex under limit circumstances, such as sexual activity at zero-gravity in outer space, are also being studied.
Pioneering researchers studied the male and female genitals during coitus (penile-vaginal penetration) with ultrasound technology in 1992 and magnetic resonance imaging (MRI) in 1999, mapping the anatomy of the activity and taking images illustrating the fit of male and female genitals.In the research using MRI, researchers imaged couples performing coitus inside an MRI machine. The magnetic resonance images also showed that the penis has the shape of a boomerang, that one third of its length consists of the root of the penis, and that the vaginal walls wrap snugly around it. Moreover, MRI during coitus indicate that the internal part of the clitoris is stimulated by penile-vaginal movements. These studies highlight the role of the clitoris and indicate that what is termed the G-spot may only exist because the highly innervated clitoris is pulled closely to the anterior wall of the vagina when the woman is sexually aroused and during vaginal penetration.
The clitoris is a female sex organ present in mammals, ostriches and a limited number of other animals. In humans, the visible portion – the glans – is at the front junction of the labia minora, above the opening of the urethra. Unlike the penis, the male homologue (equivalent) to the clitoris, it usually does not contain the distal portion of the urethra and is therefore not used for urination. The clitoris also usually lacks a reproductive function. While few animals urinate through the clitoris or use it reproductively, the spotted hyena, which has an especially large clitoris, urinates, mates, and gives birth via the organ. Some other mammals, such as lemurs and spider monkeys, also have a large clitoris.
Clitoridectomy or clitorectomy is the surgical removal, reduction, or partial removal of the clitoris. It is rarely used as a therapeutic medical procedure, such as when cancer has developed in or spread to the clitoris. It is often performed on intersex newborns. Commonly, non-medical removal of the clitoris is performed during female genital mutilation (FGM).
The labia majora are two prominent longitudinal cutaneous folds that extend downward and backward from the mons pubis to the perineum. Together with the labia minora they form the labia of the vulva.
Orgasm is the sudden discharge of accumulated sexual excitement during the sexual response cycle, resulting in rhythmic muscular contractions in the pelvic region characterized by sexual 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. The period after orgasm is often a relaxing experience, attributed to the release of the neurohormones oxytocin and prolactin as well as endorphins.
The G-spot, also called the Gräfenberg spot, is characterized as an erogenous area of the vagina that, when stimulated, may lead to strong sexual arousal, powerful orgasms and potential female ejaculation. It is typically reported to be located 5–8 cm (2–3 in) up the front (anterior) vaginal wall between the vaginal opening and the urethra and is a sensitive area that may be part of the female prostate.
The missionary position or man-on-top position is a sex position in which, generally, a woman lies on her back and a man lies on top of her while they face each other and engage in vaginal intercourse. The position may also be used for other sexual activity, such as anal sex. It is commonly associated with heterosexual sexual activity, but is also used by same-sex couples.
Doggy style is a sex position in which a person bends over, crouches on all fours, or lies on their abdomen, for sexual intercourse, other forms of sexual penetration or other sexual activity. Doggy style is a form of a rear-entry position, others being with the receiving partner lying on the side in the spoons sex position or the reverse cowgirl sex position. Non-penetrative sex in this position may also be regarded as doggy style.
The glans is a vascular structure located at the tip of the penis in male mammals or a homologous genital structure of the clitoris in female mammals.
Sexual stimulation is any stimulus that leads to, enhances and maintains sexual arousal, and may lead to orgasm. Although sexual arousal may arise without physical stimulation, achieving orgasm usually requires physical sexual stimulation.
Penile fracture is rupture of one or both of the tunica albuginea, the fibrous coverings that envelop the penis's corpora cavernosa. It is caused by rapid blunt force to an erect penis, usually during vaginal intercourse, or aggressive masturbation. It sometimes also involves partial or complete rupture of the urethra or injury to the dorsal nerves, veins and arteries.
Genital piercing is a form of body piercing that involves piercing a part of the genitalia, thus creating a suitable place for wearing different types of jewellery. Nevertheless, the term may also be used pars pro toto to indicate all body piercings in the area of anus, perineum, genitals and mons pubis, including piercings such as anal, guiche, and pubic that do not involve perforation of genitalia. Genital piercings can be done in men or women, with various forms of piercings available. The main motive for both genders is beautification and individualization; in addition, some piercings enhance sexual pleasure by increasing stimulation. Genital piercings can be found in many tribal societies, in particular in South and East Asia, where it has been part of traditional practice since ancient times. Early records of genital piercing are found in the Kama Sutra that was written over 2000 years ago.
Fingering is typically the use of fingers or hands to sexually stimulate the vulva or vagina. Vaginal fingering is legally and medically called digital penetration or digital penetration of the vagina. Fingering may also include the use of fingers to sexually stimulate the anus.
Labiaplasty is a plastic surgery procedure for altering the labia minora and the labia majora, the folds of skin surrounding the human vulva. There are two main categories of women seeking cosmetic genital surgery: those with congenital conditions such as intersex, and those with no underlying condition who experience physical discomfort or wish to alter the appearance of their genitals because they believe they do not fall within a normal range.
A clitoral pump is a sex toy designed for sexual pleasure that is applied to the clitoris or labia to create suction and increase blood flow to the genitals. This device derives from the male prototype, the penis pump, which appeared in the early 1900s and is intended for sexual enhancement, or the treatment of erectile dysfunction.
Human female sexuality encompasses a broad range of behaviors and processes, including female sexual identity and sexual behavior, the physiological, psychological, social, cultural, political, and spiritual or religious aspects of sexual activity. Various aspects and dimensions of female sexuality, as a part of human sexuality, have also been addressed by principles of ethics, morality, and theology. In almost any historical era and culture, the arts, including literary and visual arts, as well as popular culture, present a substantial portion of a given society's views on human sexuality, which include both implicit (covert) and explicit (overt) aspects and manifestations of feminine sexuality and behavior.
Clitoral erection is a physiological phenomenon where the clitoris becomes enlarged and firm.
Clitoral hood reduction, also termed clitoral hoodectomy, clitoral unhooding, clitoridotomy, or (partial) hoodectomy, is a plastic surgery procedure for reducing the size and the area of the clitoral hood (prepuce) in order to further expose the clitoral glans of the clitoris.
The vulva consists of the external female sex organs. The vulva includes the mons pubis, labia majora, labia minora, clitoris, vestibular bulbs, vulval vestibule, urinary meatus, the vaginal opening, and Bartholin's and Skene's vestibular glands. The urinary meatus is also included as it opens into the vulval vestibule. Other features of the vulva include the pudendal cleft, sebaceous glands, the urogenital triangle, and pubic hair. The vulva includes the entrance to the vagina, which leads to the uterus, and provides a double layer of protection for this by the folds of the outer and inner labia. Pelvic floor muscles support the structures of the vulva. Other muscles of the urogenital triangle also give support.
Menko Victor (Pek) van Andel, known as a ‘serendipitiologist', got his university degree in medical research in Groningen, where he developed, with the internationally known and inventive ophthalmologist Jan Worst, among other things, an artificial cornea as a treatment for blindness.
The orgasm gap, or pleasure gap, is a social phenomenon referring to the general disparity between men and women in terms of sexual satisfaction- more specifically, the unequal frequency in achievement of orgasm during sexual encounters. Currently, across every demographic that has been studied, women report the lowest frequency of reaching orgasm during sexual encounters with men. Researchers speculate there are multiple factors that may contribute to the orgasm gap. Orgasm gap researcher, Laurie Mintz claims that the primary reason for this form of gender inequality is due to “our cultural ignorance of the clitoris” and that it is commonplace to "mislabel women’s genitals by the one part that gives men, but not women, reliable orgasms".