The human penis is not small when having sex, when having sex to reach 12 centimeters is a normal physiological phenomenon. The size of the penis itself individual differences, in the soft state, the penis is small, in the state of the penis erect length greater than or equal to 10 centimeters is normal, in the sexual life can reach 12 centimeters is a normal size. The body does not have a prepuce, the body is healthy, can be a normal erection sexual intercourse, urination is not abnormal is a normal physiological phenomenon, do not need to worry about, if you usually have a long foreskin, you should be diligent to open the foreskin to clean the dirt, to prevent infection. Simple sex, but the penis is small during sex is a normal physiological phenomenon, there is no other uncomfortable, do not need to intervene, if there is sexual dysfunction, or urinary abnormalities and other uncomfortable symptoms, you should go to the hospital in a timely manner for examination and treatment.