Guilin old doctor andrology expert said that the long foreskin is a common phenomenon of male penis dysplasia. Normal male foreskin can be tightened and exposed when the penis is erect. Men with too long foreskin can't show their glans, and men with too long foreskin are more prone to premature ejaculation than ordinary men. The male foreskin is too long or phimosis, and the glans penis is wrapped by foreskin for a long time. Usually, the glans penis mucosa is less stimulated, which makes the nerve feeling of the glans penis mucosa too sensitive. The friction between the glans penis and vagina can be released at the touch of a button during sexual life, resulting in male sexual dysfunction such as premature ejaculation, impotence and sexual pain.