The size of the male sex organs is affected by a number of factors, ranging from large to small. The male sex organs include the penis, testicles, epididymis, scrotum, prostate gland, seminal vesicles and so on. The size of the sex organs changes with age, the sex organs are smaller in adolescence, with age, the sex organs gradually develop and mature, and become more stable in adulthood, the testicles will gradually shrink and become smaller in old age, while the prostate gland tissue gradually degenerates, and the connective tissue within the gland proliferates to form prostate hyperplasia. In addition, the size of male sex organs is also affected by many factors such as individual physique, obesity, different races, etc. For example, the size, length and thickness of male penis and testicles are different, so there are different sizes of male sex organs. Whether the development of male sex organs is normal or not needs to be assessed by a physician after a visit to the hospital.