I read a lot about the deterioration of health after orgasm and I can say that I have a similar problem, and, as I understand it, it is not manifested in all men.
You can read more about it in the English-language wiki - https://en.wikipedia.org/wiki/Postorgasmic_illness_syndrome
It consists in a general drop in the body's energy tone. The reasons may be multiple, but the main one seems to be an allergic reaction to his own semen when it enters the urethra. "One patient had POIS symptoms so severe that he decided to undergo removal of the testicles, prostate and seminal vesicles to relieve them These symptoms were cured. "
Specifically, my immune system is immediately suppressed, sweating appears, my eyes get very tired after ejaculation, working at a computer or driving a car becomes a big problem for the eyes, blood vessels burst instantly when they are loaded and concentration, you have to drip drops so that people are not afraid. A day after orgasm, the eyes gradually recover if they were not loaded after orgasm. I also want something sweet right away, even if I have eaten before, the blood glucose level drops sharply, I have a similar state after the gym, but to a milder extent, my eyes may slightly redden, the body requires carbohydrates, but this is quickly solved by proper nutrition and intake food passes in a few hours. Naturally, when the body works in "economy" mode, because the energy is spent, then I want to sleep to recover, even after sleep, a depressed state, as if from a hangover, but with a clear head, depression, complete apathy for work and my favorite hobbies and activities, sometimes I even postpone classes in the gym for another day since their productivity drops and I cannot fully give myself the load, I have to throw off weights in order to finish the number of approaches. In general, there is only one option in my case - a complete rejection of masturbation, sex with a girl at most once a week, and preferably in 2 weeks, otherwise the productivity of life is sharply reduced. Alas, you have to pay for pleasure with your energy. I am convinced that different people manifest in different ways, some can have sex every day and the general condition does not deteriorate, and if it worsens, then insignificantly, it all depends on the body. PS. I don’t use alcohol, drugs, I don’t smoke. I lead a healthy lifestyle, 32 years old, but the problem has existed since the age of 23-24
It becomes a pity for the money he spent for the sake of these 5 minutes, and still need to do what in the remaining 40.
The answer cannot be less than 140 characters
Because men have a reproductive instinct. That is, the goal in life is to make as many offspring as possible. And when a modern man ejaculates, in his subconscious there is an understanding that the goal has been achieved and why continue to live, he does not know.
Foreign taxonomy describes such a condition as POIS (postorgasmic illness syndrome) or postorgasmic illness syndrome, which includes headache, weakness, depressed mood and other unpleasant symptoms after orgasm. From there, it follows that this condition is described only in men, and in women it almost never occurred. The reasons are unclear, it may be problems with the vegetative like VSD or something else (hormonal reaction of the body - changes in prolactin levels, lowered cholesterol and testosterone; immune response). The first thing to consider is whether this sexual activity is associated with a feeling of shame or dissatisfaction. A person can have different corrals. And if there are no obvious reasons, then it is worth visiting a sexologist. Some people from POIS were helped by taking vitamin PP, but the main thing is not to overdo it. In a normal case, after orgasm, relaxation and drowsiness often follow and no unpleasant symptoms are observed.
P.S. recently googled all sorts of things on the internet and remembered that I once wrote an answer to this question. I'll clarify. There is a Post Orgasmic Tristesse which consists of a bad or dysphoric mood immediately after orgasm, which is normal for all (many) people. In terms of intensity, the sensation is average, tolerable, but I want to close my eyes and not pay attention to the world for at least 10 minutes. It seems to be not being treated, in any case I did not find it. Only SSRIs were offered, but this is a serious treatment for depression and one of the main side effects is sexual dysfunction, which is at least unreasonable
The second condition is POIS, which is a fairly rare disease, so it includes somatic symptoms and greatly interferes with normal life.
Here's what I found interesting on the Internet:
During orgasm in men, the biochemical composition of the blood changes: the level of serotonin, oxytocin, norepinephrine, prolactin and vasopressin increases, and glycogen decreases. Glycogen is responsible for nourishing muscles.
When glycogen levels drop sharply, the man feels a breakdown, and the brain gives the order to sleep.
The muscle mass of men is higher than that of women, so glycogen relaxes the stronger sex stronger. As a result, after sex, men quickly fall asleep, and women can only admire his sleepy profile. After sex, you should not blame the man for selfishness and inattention - glycogen is to blame for everything.
The good news for women is that during sleep, male forces, including glycogen, are restored and, upon waking up, the man is ready again to sex.
And now the fun part. From the above, we can conclude that, as a rule, men who do not experience a sharp decline in strength, simply have not very developed muscles.