Srimad-Bhagavatam: Canto 11 - Chapter 1 - Verse 24
Sanskrit:
तस्मात् सङ्गो न कर्तव्य: स्त्रीषु स्त्रैणेषु चेन्द्रियै: ।विदुषां चाप्यविस्रब्ध: षड्वर्ग: किमु मादृशाम् ॥ २४ ॥
ITRANS:
tasmāt saṅgo na kartavyaḥstrīṣu straiṇeṣu cendriyaiḥviduṣāṁ cāpy avisrabdhaḥṣaḍ-vargaḥ kim u mādṛśām
Translation:
Therefore one should never let his senses associate freely with women or with men attached to women. Even those who are highly learned cannot trust the six enemies of the mind; what to speak, then, of foolish persons like me.