From the Lord’s genitals originate water, semen, generatives, rains and the procreators. His genitals are the cause of a pleasure that counteracts the distress of begetting.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
पायुर्यमस्य मित्रस्य परिमोक्षस्य नारद । हिंसाया निरृतेर्मृत्योर्निरयस्य गुदं स्मृतः
pāyuryamasya mitrasya parimokṣasya nārada | hiṃsāyā nirṛtermṛtyornirayasya gudaṃ smṛtaḥ
SB 2.6.8