Bhagavatapurana 11.5.13

11.5.13

yad ghrāṇa-bhakṣo vihitaḥ surāyās tathā paśor ālabhanaṃ na hiṃsā /
evaṃ vyavāyaḥ prajayā na ratyā imaṃ viśuddhaṃ na viduḥ sva-dharmam //

13. Just as the use of liquor is allowed only by the sense of smell and the sacrifice of an animal is laid down, but not its torture, so also the sexual relation is sanctioned for the sake of an issue, but not for pleasure: but (some) people do not understand this pure course of their righteous duties.