The male penis can be more than 2.5cm after erection, all belong to the normal range, the diameter of 3.5cm belongs to the normal value, not too thick. A male penis that is more than 2.5cm after erection is usually within the normal range, and a penis that is 3.6cm in diameter is usually within the normal range and is not particularly thick. The length and thickness of the penis depends on its development during puberty. It is usually related to genetic factors and acquired nutritional status, so male patients can eat more protein-rich food during puberty, which helps androgen synthesis and promotes the development of penile corpus cavernosum, so that the length and thickness of the penis will increase. If you have any symptoms of physical discomfort, you should go to the regular hospital in time for consultation and treatment.