In 1983, the publication of the book "The G-Spot and Other New Discoveries of Human Sexual Behavior" co-authored by Rades, Whipple and Perry in the United States brought great changes to the sexology community, the medical community and the entire society. Sensational impact. This book summarizes the anatomy and physiology, research history and current situation of the G-spot. It undoubtedly adds new fuel and catalyst to the development of sexual medicine. Whipple and Perry proposed in 1983 that there is a specific area of ​​the anterior vaginal wall that is extremely sensitive to deep pressure. It is located at the midpoint of the line connecting the pubic symphysis and the cervix, close to the bladder neck.

In their initial study, they found that all 400 women tested had a G-spot. So they named the area after the first letter of Grafberg, the German obstetrician and gynecologist who first introduced this sensitive point. Because its location is similar to that of the male prostate, and prostate-like tissue formation is found there, these tissues discharge secretions containing prostatic acid phosphatase into the urethra through small ducts open to the urethra, so some people call this group of tissues Known as the female prostate, those glandular tissues are called paraurethral glands. Whipple and Perry also pointed out that if the G-spot is continuously stimulated, some women can also cause some women to eject a small amount of liquid from the urethra rhythmically like ejaculation. This is obviously an involuntary process. Grafberg, who collaborated with Dickens, first described this erogenous zone in 1944, and he further elaborated on it in the International Journal of Sexology in 1950. He wrote: "A erogenous zone can always be found on the front wall of the vagina along the urethra. This erogenous zone seems to be surrounded by erectile tissue... During sexual stimulation, the female urethra begins to expand, and people can clearly see that It is felt that the sensitive area increases and protrudes into the vagina. At the peak of orgasm, it becomes extremely swollen and bulges outward. After orgasm, it returns to its original size."

In fact, as early as 1672, Graf, a Dutch anatomist, introduced a glandular body or the female "prostate". He pointed out that its function is to produce mucus-serous secretions that can enhance female sexual desire. He has noticed that The pleasure produced by the female "prostate" when secreting this fluid is consistent with the pleasure caused by stimulating the male prostate. If men's prostates are continuously massaged, they can experience ejaculation and orgasm. Therefore, some people have suggested that men have two forms of orgasm: penile orgasm and prostate orgasm.

In 1978, Severi and Bennett published a review entitled "On Female Ejaculation and the Female Prostate" and they were convinced that women do have a paraurethral or periurethral structure that can swell during sexual stimulation. After learning about this theory, many gynecologists asked, why have we never discovered this structure clinically? Some explain that it is impossible to find it with routine gynecological examinations because the G-spot will only swell when it is fully stimulated, which is difficult for urologists to do.

Seeing a man's penis erect is the same thing. There are individual differences in the size of the G-spot, which is generally about the size of a coin. There are reports that the G-spot generally decreases in postmenopausal women. The existence of the G-spot can be confirmed by stroking and stimulating the front wall of the vagina on both sides of the urethra with your index finger or index and middle fingers. It often helps if you use your other hand to apply pressure above the pubic bone. Women first report a feeling of needing to urinate, but this feeling will soon disappear and change into a feeling of sexual interest, which is often a completely new feeling for many subjects. At this time, the G-spot area begins to become solid, but it is not yet connected. As stimulation of the G-spot continues, it will become as firm as rubber and feel particularly like prostate tissue. If stimulation continues and women reach orgasm, some women will eject streams of liquid from the urethra, and about 10-40% of women can eject.

Grafberg pointed out that "clonic fluid discharge often occurs at the peak of orgasm, and the two occur almost simultaneously. ... I tend to believe that the so-called 'urine' discharged during female orgasm in the literature is not real urine. It is the secretion of the glands in the urethra. These glands are closely related to the sensitive area on the front wall of the vagina that runs along the urethra. "He proposed two assumptions, so the front wall of the vagina will swell due to vascular congestion during sexual excitement. ;At the same time, the female paraurethral gland secretions will be equivalent to the male prostatic fluid. These assumptions appear to be consistent with the development of human embryos. It is worth mentioning that as early as the 1920s, Zhang Jingsheng, a modern sexologist in my country, proposed that women can ejaculate the "third type of water" during orgasm. Adigo reported in 1981 the results of analyzes of ejaculated fluid and urine samples from volunteers. The subjects were not allowed to come into contact with semen for 48 hours. They collected specimens at home, froze them immediately and sent them quickly for testing. Urea and creatinine levels in ejaculate were both significantly lower than in urine specimens, whereas prostatic acid phosphatase and glucose levels were higher than in urine.