Basic Information
Chinese name: External ejaculation
Foreign name: Coitus interruptus
Include: Spinal reflexes including efferent impulses from the pudendal nerve
Advantages: Reduce the possibility of pregnancy
Disadvantages: premature ejaculation or impotence, weight gain, headache
historical origin
The earliest records of in vitro ejaculation are in the original five classics of the Hebrew Bible, written more than 2,500 years ago in the Torah. The ancient Greeks and Romans may have preferred smaller families and therefore tried to use contraception. According to some data and cultural relics, some archaeologists have reason to believe that people already knew how to use extracorporeal ejaculation to limit fertility at that time. After the Roman Empire began to decline in the early 5th century AD, there were no records of people using contraceptives until the early 15th century. The decline in contraception combined with the continued decline of the Roman Empire resulted in the loss of many methods of contraception. From the 18th century until the development of modern contraceptive methods, ejaculation has been one of the most popular methods of contraception in Europe, North America and other places.
neural response
Ejaculation (ejaculation) is the reflex action of male animals to emit semen during sexual activity. In humans, ejaculation is a series of coordinated actions through the unilateral segments of the reproductive tract, with semen ejected from the penis. Ejaculation involves a two-step spinal reflex, the primary center being the lumbosacral spinal cord, which finds impulses afferent from tactile receptors in the glans penis. The first step of ejaculation is the contraction of the vas deferens and seminal vesicle smooth muscles caused by the sympathetic nerve efferent impulse, thereby transferring the semen in the vas deferens and seminal vesicles to the urethra; the second step of ejaculation relies on the efferent impulse of the pudendal nerve to contract the striated muscle at the root of the penis , thereby emitting semen from the urethra. The excitation of the superior part of the brain travels through the descending pathway, and also acts on the erection center of the spinal cord and the external ejaculation center. Normal human sexual excitement stimuli from various senses travel through the brain and affect spinal reflex behavior.
Ejaculation is a complex process that includes erection, ejaculation, ejaculation, and orgasm. The erection is due to the swelling and hardening of the penis, and its primary innervation comes from the sacral plexus and the splanchnic or erectile nerves of the pelvis. Ejaculation involves collecting semen before ejaculation and transporting it to the prostatic portion of the urethra, which becomes a semen reservoir with the closure of the bladder neck and distal urethral sphincter. This induces ejaculation, the rhythmic emission of semen through the urethra, in which the involvement of the skeletal muscles of the perineum is essential. Male orgasm is a brain-involved, emotionally pleasurable event that is closely related to ejaculation.
Academic Research
The neurophysiology of extracorporeal ejaculation has only been identified in single-sided pieces. Studies have shown that the dopaminergic system promotes ejaculation and the serotonin-activated system enables ejaculation. The main neural mechanism of external ejaculation is the innervation of the body, but also includes nerves and fibers from the autonomic nervous system in the pubic region. The autonomic branch of the parasympathetic nerve primarily controls erectile function, while the sympathetic and somatic branches of the nerve primarily control firing and ejaculation.
During sexual activity, the found stimulus travels through the found branch of the pudendal nerve (which belongs to the somatic nerve), which emerges from the genitals and penetrates the sacral plexus to the spinal cord. The precise site that controls external ejaculation has not been elucidated, but the hypothalamus is thought to be involved. The ejaculation center in the brain sends stimulating impulses to the sympathetic trunk of the spinal cord, which travels through the upper hypogastric plexus and hypogastric nerve to the scrotum, vas deferens, prostate and other organs related to male ejaculation. The sympathetic nerves that innervate the bladder neck close the bladder neck, which is necessary to prevent retrograde external ejaculation. Neural messages, either from the supergroup or from the spinal reflex, are transmitted to the sacral plexus and travel through the motor branch of the pudendal nerve to the striated muscle of the perineum to cause external ejaculation characterized by rhythmic contractions. Muscles in this area include bulbocavernosus, ischiococcygeus, and pubococcygeus.
advantage
Many people prefer to use ejaculation as a contraceptive method because taking the pill has great side effects, such as depression, vaginal dryness, loss of libido, weight gain, headaches, etc. Extracorporeal ejaculation does not require any cost, does not require any tools or drugs, and does not affect the pleasure of sex.
Effect
Like many other contraceptive methods, the key to success with IVF is proper use and consistency. Some research groups have found that the failure rate of extracorporeal ejaculation is about 15% to 28% without focusing on the correct method. In contrast, the failure rate for the pill is about 2% to 8%, the failure rate for the IUD is only about 0.8%, and the failure rate for the condom is between 10% and 18%. Some believe that the effect of using IVF is similar to that of using a condom, but further research is needed in this regard.
When couples used contraception correctly every time they had sex, the failure rate for external ejaculation was 4%, compared to 0.3% when they used birth control every time they had sex. , the failure rate of IUD use was 0.6%, and the failure rate of condom use was 2%. The main reason for the failure of extracorporeal ejaculation contraceptive method is that at the moment of ejaculation, if the man fails to withdraw his penis in time, part of the semen will be ejaculated into the vagina, thus causing the woman to become pregnant. Some people also believe that the failure of in vitro ejaculation contraceptive method is because before the man ejaculates, some sperm will inadvertently flow out and enter the woman's vagina to cause pregnancy.
Some research tissues did not find sperm that could cause pregnancy in the body fluids excreted before ejaculation. Most people think that the reason for the failure of ejaculation is that a small amount of semen flows into the woman's vagina before ejaculation. based on the above reasons, some experts suggest that men should urinate before sexual intercourse to remove residual sperm in the urethra, wash the penis as soon as possible after ejaculation, and avoid touching the woman's vulva with hands.
shortcoming
Compared with the use of condoms, contraceptive pills, and the use of IUDs, the success rate of external ejaculation is low. Although there is no cost to use external ejaculation, the user is exposed to a greater risk of pregnancy due to the low success rate. If a partner has an STD or AIDS, using ejaculation does not prevent transmission. Because viruses and bacteria are also transmitted to each other through body fluids and mucous membranes. A man who suddenly interrupts sexual intercourse when he reaches orgasm can cause frustration and dissatisfaction with his partner. Scientists Masters and Johnson believe that frequent use of external ejaculation can cause premature ejaculation or impotence. During the process of sexual intercourse, due to sexual excitement, the penis will have an erection phenomenon. If the sexual intercourse is forcibly stopped at this time, the function of the central nervous system and the ejaculation center of the lumbar cuboid will be impaired.
harm
Some young couples use the contraceptive method of excretion during sex. This method seems simple and easy, but it has many harms. Ejaculation that leads to contraceptive failure refers to the interruption of sexual intercourse immediately at the moment of orgasm, which is about to ejaculate, so that the semen is discharged outside. This natural contraceptive method often fails to achieve the purpose of contraception. There are three reasons for failure:
1. Sperm cells usually flow out a few drops from the urethra with the contraction of the vas deferens before ejaculation. Each drop contains about 50,000 sperm. If it flows into the vagina, one drop of semen is enough to fertilize a woman;
2. In the most tense stage of sprinting, the timing of pulling out the penis may be too late because of the man's attachment to pleasure, so that part of the semen is ejaculated in the vagina;
3. Sometimes after ejaculation outside the body, the man immediately touches the woman's pussy to make her orgasm, or has a second intercourse soon after, in both cases, the fingers and the penis may bring the sperm into the vagina again. .
induced neurasthenia
During the whole process of sexual life, the sexual response of men is completed under the control of the cerebral cortex. Psychological and physiological stimulation during sexual intercourse will cause a series of changes, high excitement will make mental tension, rapid heartbeat, blood pressure rise and so on. At the same time, the reproductive organs manifested as penile vascular congestion and muscle contraction and erection. If the sexual intercourse is suddenly interrupted when the climax is reached, it is bound to have an adverse effect on the sexual psychology. Over time, it is prone to sexual neurasthenia, causing premature ejaculation, impotence and other symptoms.
prone to functional infertility
Orgasm due to sexual arousal during sexual intercourse, and the erection of the penis becomes harder before ejaculation. Forcibly interrupting sexual intercourse at this time and excreting sperm will cause dysfunction of the central nervous system and the lumbosacral ejaculation center. Over time, it is easy to suffer from functional amenorrhea.
It is easy to make women suffer from frigidity
When the sexual intercourse reaches the climax, the woman does not get sexual satisfaction at this time. The man forcibly interrupts the sexual intercourse and excretes sperm from the body, which makes the woman's sexual excitement plummet and is psychologically stimulated.
It is easy to cause disharmony between husband and wife
A normal, moderate and harmonious sex life can enhance the relationship between husband and wife, and the seemingly scientific and unscientific contraceptive method of ectopic ejaculation often causes estrangement between husband and wife. If the woman is pregnant, the man does not think that the semen has entered the vagina in advance, but mistakenly thinks that the woman is infidelity, which causes a quarrel; and forcibly interrupting the sexual life, the woman cannot get sexual satisfaction, her sexual psychology is suppressed, and she will have sexual intercourse. Disgust, cast a shadow over the relationship between husband and wife. It can be seen from this that the excretion of sperm is insufficient, and it is better to take other contraceptive methods between husband and wife.
Couples cannot fully enjoy the pleasure body
External ejaculation will make young men who lack sexual experience develop a rapid ejaculation response. Men cannot sprint in the vagina until ejaculation, and can not enjoy the pleasure of orgasm without restraint. At the same time, both physically and psychologically, both men and women will think that the vagina is only an organ used for men to obtain the pleasure of ejaculation.
prone to premature ejaculation
But ejaculation can cause a pretty serious sexual problem: premature ejaculation. The most common procedure for men and women who use external ejaculation for contraception is to stimulate the man to a very excited stage in the prelude, forcefully pump it several times after insertion, and suddenly pull out the ejaculate, which can satisfy the man and ensure that the woman will not become pregnant. However, both men and women, because they easily fall into the trap of sexual psychology, ignore the concept that men should help women satisfy at the beginning. Therefore, before long, men will develop the habit of premature ejaculation.
failure rate
Although the method of external ejaculation is simple, it is not reliable and has a high failure rate. The reason for the failure was that the man had ejaculated a small amount of semen into the vagina before pulling the penis out of the vagina. Because ejaculation and ejaculation are a continuous action, and the time interval between them is very short, most men cannot accurately grasp the timing, and even when they are about to reach orgasm, they cannot withdraw the penis from the vagina in time, so that the initial ejaculation The semen is discharged into a woman's vagina, and this part of the semen contains the most sperm, so it is easy to lead to pregnancy. This is the main reason for the failure of in vitro ejaculation contraception.
Second, men often have a small amount of sperm entering the vagina before ejaculation occurs. This is the sperm accumulated in the vas deferens, in the process of sexual excitement, with the contraction of the vas deferens, it is discharged into the urethra first, and then overflows into the vagina with the secretion of the urethra. This extravasation of sperm that occurs before ejaculation is uncontrollable and can lead to contraceptive failure as a result. In vitro ejaculation is a method of intercourse interruption contraception. In order to prevent the ejaculation of semen into the vagina, both husband and wife (especially the man) are highly nervous during sexual life, and suddenly interrupt when sexual intercourse occurs orgasm, which will affect the appearance of orgasm and fail to achieve sexual satisfaction. There will be neurasthenia, and some men may experience sexual dysfunction, such as premature ejaculation, impotence and so on.
Since this method of contraception is not effective, it is not appropriate to use it when there are many contraceptive methods. Although it is theoretically impossible to get pregnant through external ejaculation, in fact, we have also seen couples who have accidentally conceived because of external ejaculation. Some people feel that as long as they don't ejaculate, they won't get pregnant and don't take any safety measures. In fact, the fact that the hymen is not broken does not mean that sperm cannot swim into the uterus. There is a hole in the middle of the hymen, and it is not a completely closed membrane. Otherwise, women's menstruation will not come out. "Even if you don't ejaculate, a small amount of semen will remain in the woman's body during the previous sexual act, and the sperm will swim into the uterus. If you meet the woman's ovulation period, once the sperm meets the egg, pregnancy will occur. External ejaculation refers to a method in which the penis is drawn out when ejaculation is about to occur during sexual life, so that the semen is ejaculated outside the woman's body. It is often used as a contraceptive method, but this method is unreliable and has certain effects on the body. harm.
