 बीजमात्रं पिता जन्तो श्शुक्लं रुधिरमेव च।संयुक्तमृतुमन्मात्रा पुरुषस्येह जन्म तत्।। 
 For a living being, the father is only a drop of white blood semen. During her menstrual period this is blended in the mothers womb due to which a man is born in this world. 