To make it possible to enhance vigor and to execute the remarkable sperm production operation by such an environment as to stimulate the working instinct of the testis by adding restrictions to the scrotum action to make the action separate and independent.

The corresponding part of the genitalia 1 existing in the middle on the front of underwear of an energy strengthening method, such as special shorts or drawers which are formed to eliminate the bulge of the pubic region of the shorts for male, etc., and to make a tight fit to the body and are made from ordinary cloth, knitting, etc., is provided with a hole 2 for drawing out the pubic part. The restriction of this hole 2 for drawing out by tightening means or restraining means, such as cords or rubber cords 2A, fasteners, fittings or soft planar objects, according to conditions is made possible. The restrictions are applied to the expansion and contraction or housing actions of the testicle levator and the scrotum cortex so as to prevent the scrotum 3 and the testis after drawing out of the hole 2 for drawing out from being withdrawn to the inner side. This state is detained on the outer side of the part corresponding to the genitalia 1, i.e., in the spacing 7 between the underwear body of the pants, shorts, etc., and the inner side of outer cloth 6.