Alot of people forget this thats why, semen doesnt need to come out to your body, its just goes out for the purpose of propagation of species. An opinion has gained ground in modern times, not only among the general public, but also among physicians, that the belief in the physiological value of continence belongs to the dark ages of religious superstitions and scientific ignorance, and is incompatible with physiological knowledge. Certain pseudosexologists, have exploited this idea to their commercial advantage and have created in the public mind a phobia in regards to continence, which is regarded as a cause of nervous and mental diseases and a positive health danger. On the basis of this belief, physicians and psychoanalysts have looked on continence for the cause of the nervous ailments of youth and have advised young men to visit prostitutes and risk venereal infection as a lesser evil than the assumed hazards of abstinence. A careful reading should, however, convince any open-minded reader that the above view is false, and that continence per se can never do harm, but is always beneficial; and that when trouble occurs in an individual not practicing normal sex relations, the fault is not continence but some vicarious means of sex expression, excessive nocturnal emissions, etc. In view of the richness of the semen in lecithin, cholesterol, phosphorus and other constituents of nervous and brain tissue it is clear that it is incontinence, or loss of these valuable nerve-nourishing substances which, by promoting undernutrition, is responsible for disturbed functioning of the nervous system and brain, and never true continence, contrary to the unscientific views of the psychoanalysts. We have seen that the internal secretions of the sex glands stand at the basis of the individual's physical and mental vitality and that sex hormones are present in the external as well as in the internal secretions of the gonads. Many of the effects attributed to such hormones, as we have seen, are due to the physiological effect of resorbed semen. Conservation of semen means conservation of sex hormones and increased vigor, while loss of semen means loss of hormones and diminished vitality; also chronic deficiency of such hormones leads to the symptoms of senility, which Voronoff and Steinach strove to overcome by increasing the amount of sex hormones in the blood. The semen is a viscid albuminous fluid, alkaline in reaction, which is very rich in calcium and phosphorus, also in lecithin, cholesterol, albumen, nucleoproteins, iron, vitamin E, etc. In the ejaculation of the normal man, about 226 million spermatozoa are given off; these are rich in phosphorized fats (lecithin), cholesterol (the parent-source of sex hormones), nucleoproteins and iron. An ounce of semen is considered to be equal in value to sixty ounces of blood, of which it constitutes an extract of some of its most valuable of constituents, as far as its vitalizing power is concerned. Dr. Frederick McCann remarks on this point, "From what has been stated it must be admitted that the spermatic fluid does possess potentialities justifying the belief of ancient writers concerning its vital properties. The semen contains substances of high physiological value, especially in relation to the nutrition of the brain and nervous system. If resorption of semen through the wall of the female genital tract has a vitalizing effect on the female organism, the same should be the case in the body of the male in which it is formed and conserved. And conversely, loss of semen must deprive the organism of vitality and valuable substances necessary for the nutrition of nervous tissue, such as lecithin, which has been used therapeutically with great success for the cure of neurasthenia  resulting from sexual excess.