Mahabharata 12.318.25

गर्भमूत्रपुरीषाणां स्वभावनियता गतिःधारणे वा विसर्गे वा न कर्तुर्विद्यते वशः

garbhamūtrapurīṣāṇāṃ svabhāvaniyatā gatiḥdhāraṇe vā visarge vā na karturvidyate vaśaḥ

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