Now unite in sexual life as man and woman, and in this way, by sexual intercourse, you will be able to beget hundreds of children in the womb of this girl to increase the population.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
मिथुनव्यवायधर्मस्त्वं प्रजासर्गमिमं पुनः । मिथुनव्यवायधर्मिण्यां भूरिशो भावयिष्यसि
mithunavyavāyadharmastvaṃ prajāsargamimaṃ punaḥ | mithunavyavāyadharmiṇyāṃ bhūriśo bhāvayiṣyasi
SB 6.4.52