The characteristics of "little brother", the secret that men must know

1. The penis has a mind of its own

Many men have noticed that their penises take over and suddenly become erect when they don't want them to. Research has found that compared to other parts of the body, such as the limbs, people have limited control over the penis because it is not always under the control of the nervous system, but is also led by the "autonomic nervous system", also known as the vegetative nervous system, which is also responsible for regulating heart rate and blood pressure. Many sexual arousals are "credited" to the autonomic nervous system. For example, during the rapid eye movement stage of sleep, pulses from the brain can induce erections, and lifting weights and tightening the abdomen and anus can also promote penile erections.

2. Your penis can shrink when you least expect it

Dr. Montag, an American urologist, pointed out that exposure to cold water or air can shrink the penis, and psychological pressure can also make it sluggish. These are all controlled by the autonomic nervous system, so the penis can also be regarded as a "barometer of the autonomic nervous system."

3. The penis is "very low-key"

Sexologist Kinsey studied more than 1,000 men and found that 12% of them had a penis that was less than one-third larger after erection, and 7% had a penis that was doubled. Those penises that seemed short in normal state could be twice as large as those of "big guys" after erection.

4. The first penis can also be broken

Although there are no bones in the penis, it can still break and make a noise, then turn blue and be extremely painful. This happens mainly to young men. A typical case is that the man rushes too fast and hits his partner's pubic bone. To avoid this, don't be too rough during sex.