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The urethral sponge is composed of erectile tissue; during arousal, it becomes swollen with blood, compressing the urethra, helping prevent urination during sexual activity (along with the pubococcygeus muscle). Additionally, the urethral sponge contains the Skene's glands, which with continued stimulation, may produce an ejaculate (usually clear in color) and release it through the urethra during sexual activity or orgasm. Once considered to be urinary incontinence, the ejaculate is not urine, although it is sometimes mixed with urine, and is similar to that produced by the prostateThe prostate is a gland that is part of male mammalian sex organs. Its main function is to secrete and store a clear, slightly acidic fluid that is part of semen. A healthy prostate is approximately the size of a walnut. It surrounds the urethra just belo in men. This is said to be a female ejaculationFemale ejaculation refers to the expulsion of noticeable amounts of fluid from the urethra by female humans during orgasm. The largest component of this fluid is said to be generated by Skene's glands. The fluid is said by many simply to be urine (due to.

The urethral sponge encompasses a large number of pleasurable nerve endingA nerve is an enclosed, cable-like bundle of nerve fibers or axons, which includes the glia that ensheath the axons in myelin. Neurons are sometimes called nerve cells though this term is technically imprecise since many neurons do not form nerves. Nervess, and can, therefore, be stimulated through the front wall of the vagina. Some women enjoy the rear-entry position of sexual intercourse for this reason, because the penis is often angled slightly downward and can stimulate the front wall of the vagina, and in turn, the urethral sponge.

In fact, the urethral sponge is often synonymously called the G-spot (Gräfenberg spot), although some say that the two are separate. Some women experience intense pleasure from stimulation of the urethral sponge and others find the sensation irritating. The urethral sponge also surrounds the clitoral nerve, and since the two are so closely interconnected, stimulation of the clitoris may stimulate the nerve endings of the urethral sponge.