This mudra should be attempted only under the guidance of an expert teacher (Guru), otherwise permanent injury may result.
Sit in any comfortable meditative asana. Place the hands on the knees, close the eyes and relax. Try to draw the sexual organs upwards by pulling the lower abdomen and contracting the urinary system. A rubber tube of about 12 inches long can be inserted into the urethra. Through this, the water is drawn up. When the perfected milk is drawn through the tube, then honey and finally mercury is drawn up. After prolonged practice these liquids can be drawn from the urethra without using the catheter.
This mudra has a strong influence on the vajra sexual organs with vital energy. It controls energy that is normally lost with the discharge of semen. This is a good method for establishing brahmacharya.