It is normal for a man to be more concerned about the size of his penis. The problem is that some people are so concerned that they think their penis is ‘too small’ and this leads to psychological problems. Recently the British Journal of Urology, an authoritative British medical journal, published a professional article that explains from a scientific point of view how much the penis size has to do with sex. 1. What is the size of the penis? Summarizing a recent study that measured 15,000 men, the average length of the penis when erect was 13.12 centimeters and the average circumference was 11.66 centimeters. In a weak condition the average length was 9.16 centimeters and the circumference was 9.31 centimeters. Of course these males are from Europe and the Middle East, which differs somewhat from the Asian and Chinese. Measurements have also been made on the penises of Chinese residents and found that the average length of the penis without erection is 7.1 centimeters and the circumference is about 7.8 centimeters; when erect the average length is about 13.0 centimeters and the average circumference is 12.2 centimeters. The Chinese penis is shorter in the case of weakness, but the length when erect is similar to that of foreigners. 2, the thicker the penis is the more attractive to the woman? It is generally believed that the thicker and longer the penis is, the better the sexual performance will be, and this view is more common among men; they tend to be more confident. However, women’s preferences for the size of a man’s penis vary, and between length and thickness, most women prefer a thicker penis over length. They believe that a thicker penis is more capable of giving them sexual pleasure than a longer one. Another person showed women 3D animated images of a penis in a weak state, and in general, the larger the penis the more attractive it is to women, but as penis size continues to increase, this increase in attractiveness decreases. This indicates that women have a psychological expectation of the size of the penis, under which the attraction of the penis to women increases as the size increases. More than this value will not cause an increase in the interest of the female partner. 3. Does the size of the penis really affect sexual satisfaction? From a scientific point of view, there is no direct correlation between thick and long penis and sexual satisfaction. The quality and duration of erection can affect sexual satisfaction more than the size of the penis. For most women, the chances of having an orgasm from vaginal stimulation are small, and orgasms come mainly from the clitoris rather than the vagina. It is currently believed that the thick and long penis will only cause more female psychological expectations and sexual desire, and no direct link with the female orgasm. 4. Do women care about penis size? Research has also found that women don’t care much about penis size. The survey found that women care more about a man’s personality, intelligence and sense of humor than the size of his penis. Instead, most women think men are a bit overly concerned about penis size. One scholar surveyed 50,000 men and women, 85% of whom were satisfied with the size of their spouse’s penis, while in turn only 55% of men were satisfied with the size of their penis. In fact, from a professional point of view, the larger penis is just a little increase in self-confidence, and will not have any other advantages.