Does the size of a man’s penis bring different feelings to women? Many men want their penises to be thick and large, which seems to be associated with a man having a strong and powerful sexual function. Women are equally very concerned and want their men to have thick sexual organs. Is there really a correlation between penis size and sex quality? There are significant individualized differences in the length of the penis. The average adult male penis length in a weak state is 5-6 cm. The length in the erect state is two times longer than in the weak state. Short penis is defined as an erect length of less than 8 cm and a weak length of less than 4 cm. There are many causes of penile shortening, the most common underlying cause is genetic factors; followed by pseudo-penile shortening, a common factor is obesity leading to occult penis; penile shortening with erectile dysfunction examination needs to consider androgen deficiency caused by abnormal penile development. The main function of the penis is in the hardness and duration of the erect state, not the length. Judging the size and sexual function of the penis by superficial phenomena is entirely psychological and does not correspond to the facts. From the analysis of female anatomy, on the one hand the vagina is more elastic and stretchable and can adapt to different lengths. On the other hand, the sensory nerves of the vagina are located in the outer 1/3 of the vagina, while the G-spot (sensitive erogenous zone) is located 4 cm from the vaginal opening on the front wall of the vagina. The normal male penis in its erect state is sufficient to stimulate the sexual arousal point of the vagina and evoke female orgasm. The key is to grasp the advantages of each and give full play to the role of sexual skills, in addition to the end of puberty, the penis has developed and mature, the length is not changing, do not blindly use drugs.