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Vaginal contractions are caused by both the activity of certain brain regions and the release of the hormone oxytocin. It has been suggested that vaginal contractions during orgasm can increase the chances of pregnancy as they transport sperm up the reproductive tract from the vagina to the oviducts, which decreases the distance it has to travel.
Older women produce less vaginal lubrication and studies have investigated changes to degrees of satisfaction, frequency of sexual activity, to desire, sexual thoughts and fantasies, sexual arousal, beliefs about and attitudes to sex, pain, and the ability to reach orgasm in women in their 40s and after menopause. Other factors have also been ...
Arousal is triggered through these receptors in these body parts, [7] which cause the release of pleasure-causing chemicals that act as mental rewards to pursue such stimulation. Someone may become aroused by simply touching another person, though the bulbocavernosus reflex only occurs when a sexual organ (penis or clitoris) is stimulated.
The hypothesis of two modes of female orgasm – vaginal or clitoral – is not tenable. Rather, it is a complex reaction in which all organ systems of the human body are involved. [63] [64] [65] Without clitoral stimulation, 23.3% of women reach orgasm during vaginal intercourse, with simultaneous clitoral stimulation 74%. [66]
However, besides making sexual intercourse painful for the female, [15] the practice is believed to increase the risk of transmitting sexually transmitted infections for both partners, [15] such as HIV, with which the risk of transmission is increased by lacerations in the vaginal tissue resulting from the lack of lubrication.
The term vagina is from Latin vāgīna, meaning "sheath" or "scabbard". [1] The vagina may also be referred to as the birth canal in the context of pregnancy and childbirth. [2] [3] Although by its dictionary and anatomical definitions, the term vagina refers exclusively to the specific internal structure, it is colloquially used to refer to the vulva or to both the vagina and vulva.
“The brain is the body's most important sexual organ, so one of the best ways to increase the intensity of your orgasm is to increase arousal—for example, by fantasizing and living out your ...
Vagusstoff (literally translated from German as "Vagus Substance") refers to the substance released by stimulation of the vagus nerve which causes a reduction in the heart rate. Discovered in 1921 by physiologist Otto Loewi , vagusstoff was the first confirmation of chemical synaptic transmission and the first neurotransmitter ever discovered.