In an act of sexual intercourse, when two persons of opposite sexes come into contact with one another, the embryo takes birth in the womb, like a calamity attacking the mother.
अन्योन्यं समभिप्रेत्य मैथुनस्य समागमे। उपद्रव इवाविष्टो योनि गर्भः प्रपद्यते॥