Bhagavad Gita Chapter 7.11
balaḿ balavatāḿ cāhaḿ
kāma-rāga-vivarjitam
dharmāviruddho bhūteṣu
kāmo ’smi bharatarṣabha
Translation
I am the strength of the strong, devoid of passion and desire. I am sex life which is not contrary to religious principles, O lord of the Bharatas [Arjuna].