Viagra is a PDE5 inhibitor. PDE5 is an enzyme that promotes the degradation of cGMP in the blood, cGMP regulates blood volume in the penis, so reducing cGMP makes it difficult for men to get an erection. Viagra acts primarily on the circulatory and reproductive systems.

According to the World Health Organization, most men's penises will produce between 39 million and 929 million sperm per ejaculation. But how much do you really know about sperm? Here, we'll debunk some common myths about sperm that you may have believed to be true.

Erectile dysfunction is a concern for many men. However, due to the view that this is a secret disease, it leads to a feeling of inferiority and guilt, causing very few people to confide or seek treatment at a medical facility. So can erectile dysfunction be cured and how?

Many men, even though they have never had sex, still discover itchy pimples on their penis. Sometimes the pimples are small and grow alone, do not cause itching but cause the penis to discharge pus. In this case, men are very worried about what disease is the pimple on the penis?

In some men, the phenomenon of reaching orgasm but not ejaculating during sex is called retrograde ejaculation. Men who experience this disorder can lead to the risk of infertility.

Retrograde ejaculation is a disorder of ejaculation that can adversely affect reproductive health and even cause male infertility. There are many causes of retrograde ejaculation, including prostate disease.

Not being able to get an erection for a long time not only makes men stressed, anxious and lose confidence in themselves, but also affects the quality of their mental, emotional and sexual life. So why is it difficult for the penis to get an erection and maintain it for a long time?

Morning erection is when the penis is filled with blood and becomes erect. Morning erections right after men wake up are very common. Many people still ask the question "why do I have an erection in the morning?"

foul-smelling penis can be a sign of many genital diseases such as gonorrhea, urethritis, fungal infections, chlamydia, and urinary tract infections.

Balanitis is a slow-progressing disease and does not quickly destroy the private area and physiological function. However, prolonged balanitis will leave serious complications to the health and quality of life of men.

Most men are very concerned about penis issues such as how long is enough or what to do if the penis is small. But besides the size, there are still some surprising things that you do not know about your penis.