Mahabharata 12.200.37
द्वापरे मैथुनो धर्मः प्रजानामभवन्नृपतथा कलियुगे राजन्द्वंद्वमापेदिरे जनाः
dvāpare maithuno dharmaḥ prajānāmabhavannṛpatathā kaliyuge rājandvaṃdvamāpedire janāḥ
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book