Manava Dharmashastra 2.215

2.215

ato viviktāsanaḥ nirjane śūnye gṛhādau nāsīta | nāpi niḥśaṅkamaṅgasparśādi kuryāt | aticapalo hīndriyasaṅghātaḥ vidvāṃsamapi śāstranigṛhītātmānamapi karṣati harati paratantrīkaroti |

One should not sit alone with his mother, sister or daughter. The powerful host of sense-organs overpowers even the learned.—(215)

Medhātithi’s commentary (manubhāṣya):
For reasons above described ‘one should not sit alone’—in a solitary room, etc., one should not sit; nor should he touch the body, etc. Because the host of sense-organs is extremely fickle; and it ‘overpowers’—draws, makes helpless —‘even the learned’—i.e., the person who has his mind fully controlled by wisdom acquired from the scriptures.—(215)

Comparative notes by various authors
(verses 213-215)
See Comparative notes for Verse 2.213.