Mahabharata 13.116.75
तिर्यग्योनिं न गच्छेत रूपवांश्च भवेन्नरःबुद्धिमान्वै कुरुश्रेष्ठ प्राप्नुयाच्च महद्यशः
tiryagyoniṃ na gaccheta rūpavāṃśca bhavennaraḥbuddhimānvai kuruśreṣṭha prāpnuyācca mahadyaśaḥ
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book