Avoiding common misconceptions about sex and learning about men's health.

Are men who can have prolonged sex "powerful"?

Actually, this is a self-righteous misconception held by men, who believe that the longer they can last, the more capable and skilled they are.

However, for women, prolonged sexual activity not only fails to arouse them but can also cause discomfort due to continuous friction. Furthermore, excessive vaginal lubrication from prolonged intercourse can actually reduce pleasure.

For most women, prolonged intercourse or frequent changes in positions can easily lead to vaginal spasms, pain, or bleeding.

Therefore, instead of prolonging intercourse, it's better to focus on cultivating a positive foreplay experience.

Cultivating a loving atmosphere and treating your partner with tenderness and care is far more effective than trying to prolong the duration or employing various challenging positions.

Does a longer penis lead to greater female satisfaction?

There's a long-standing misconception among men about penis length—that a shorter penis hinders sex, while a longer penis makes it easier to please a woman and bring her to orgasm.

Regardless of whether this view is true or false, let's first understand what a normal penis length should be.

The average adult male penis is about 6.55 centimeters long, reaching about 15 centimeters when erect. Of course, there are slight variations, but regardless of length, it fulfills its function. Sometimes, a penis longer than average only looks impressive and doesn't necessarily make it more effective than a shorter one. For women, seeing such a penis for the first time might even be startling.

That said, many men are still very concerned about penis length. Here, I want to tell readers a correct concept: the length of an erect penis is not directly proportional to its appearance; therefore, a longer penis doesn't necessarily mean it will always be longer.

Some men may have penises shorter than the average, but this does not necessarily indicate a sexual dysfunction or hinder sexual activity. While penis size varies, the female vagina adapts well to the length of the penis, so there's no need to worry.

Generally, a penis reaching 7-8 centimeters when erect is sufficient for sexual intercourse, while an excessively long penis can cause discomfort for the woman.

If you're still concerned about your partner's satisfaction, focus on foreplay.

First, arouse your partner's desire, then during intercourse, use your hands to caress or directly stimulate the woman's clitoris to help her reach orgasm.

What is nocturnal emission? What symptoms indicate a pathological condition?

Nocturnal emission refers to the involuntary ejaculation of semen in adult men without sexual intercourse. If there are no other symptoms and the frequency is infrequent, this is a normal physiological phenomenon and not considered pathological. However, if nocturnal emission occurs more than once a week, or several times a day, regardless of whether it involves dreams or not, and is accompanied by dizziness, weakness, lower back pain, leg weakness, tinnitus, weight loss, fatigue, mental confusion, shortness of breath, and sweating, it is considered a pathological condition.

What are the main functions of the kidneys?

The human body has two kidneys, left and right. They are the main excretory organs, playing a crucial role in regulating and maintaining the quantity and composition of body fluids in the internal environment. The main functions of the kidneys are:

Firstly, secreting urine to eliminate metabolic waste, toxins, and drugs. Although the kidneys are small, the blood flow through them is 600-800 ml per minute, thus filtering the entire body's blood approximately once every 10 minutes. The glomerulus filtrates about 120 ml per minute, and the normal daily urine output is 1500 ml. About 80% of this is absorbed by the proximal convoluted tubule, while the remainder is excreted and absorbed by the distal convoluted tubule and collecting duct according to the body's needs. In the proximal convoluted tubule, glucose, amino acids, and vitamins are selectively reabsorbed. Trace amounts of protein and approximately 80% of electrolytes, such as sodium salts, are filtered out. Oxides are only partially absorbed, while urea, inosine, and non-protein metabolites are absorbed very little or not at all. Many toxins and drugs are often excreted in urine via the kidneys; for example, antibiotics such as streptomycin, tetracycline, and oxytetracycline are all filtered out by the glomerulus.

Secondly, the kidneys regulate water and osmotic pressure. We know that about 80% of water is reabsorbed along with sodium in the proximal convoluted tubule, therefore the filtrate in the proximal convoluted tubule is an osmotic fluid. As urea and other substances seep into the filtrate from outside the renal tubules, the osmotic pressure increases; as the filtrate passes through the ascending limb, the osmotic pressure continuously decreases due to the large amount of sodium reabsorbed. Water is reabsorbed from the hypotonic filtrate in the distal convoluted tubule and then concentrated into urine via the collecting duct.

Thirdly, the kidneys regulate electrolyte concentration and total amount. After electrolytes enter the renal tubules with the filtrate, most of sodium, potassium, calcium, magnesium, carbonic acid, hydrogen, and inorganic phosphorus are reabsorbed. The amount absorbed depends on the body's needs and is regulated by neuroendocrine and humoral mechanisms. During sodium reabsorption, sodium often exchanges with potassium, hydrogen, and ammonium, thus regulating acid-base balance. Fourth, the kidneys regulate the excretion of non-volatile acids and bases, the formation of ammonia, and maintain acid-base balance. Fifth, they regulate blood pressure. Sixth, the kidneys secrete erythropoietin.

The health of the kidneys plays a vital role in lifespan, fertility, and sexual function. Currently, due to stressful lifestyles, long nights, and poor rest, people need to nourish their kidneys. Due to kidney deficiency, many men experience kidney yang deficiency, kidney yin deficiency, impotence, weak erections, spermatorrhea, premature ejaculation, and nocturnal emission, which can even affect marital relationships.