Mahabharata 13.45.21

आर्षे गोमिथुनं शुल्कं केचिदाहुर्मृषैव तत्अल्पं वा बहु वा राजन्विक्रयस्तावदेव सः

ārṣe gomithunaṃ śulkaṃ kecidāhurmṛṣaiva tatalpaṃ vā bahu vā rājanvikrayastāvadeva saḥ

Our plain-language meaning of this verse is waiting for scholar review.