Ramayana
बीजमात्रं पिता जन्तोः शुक्लं रुधिरमेव च । संयुक्तमृतुमन्मात्रा पुरुषस्येह जन्म तत् ॥ २-१०८-११
For a living being, the father is only a drop of white blood (semen). Having her menstrual period (favourable time for conception) this is blended in the mother's womb due to which a man is born in this world. ॥ 2-108-11॥
english translation
bIjamAtraM pitA jantoH zuklaM rudhirameva ca । saMyuktamRtumanmAtrA puruSasyeha janma tat ॥ 2-108-11
hk transliteration by Sanscript