SB 11.14.29

strīṇāṁ strī-saṅgināṁ saṅgaṁ
 tyaktvā dūrata ātmavān
kṣeme vivikta āsīnaś
 cintayen mām atandritaḥ
Word for word: 
strīṇām — of women; strī — to women; saṅginām — of those who are attached or intimately associated; saṅgam — association; tyaktvā — giving up; dūrataḥ — far away; ātma-vān — being conscious of the self; kṣeme — fearless; vivikte — in a separated or isolated place; āsīnaḥ — sitting; cintayet — one should concentrate; mām — on Me; atandritaḥ — with great care.
Translation: 
Being conscious of the eternal self, one should give up association with women and those intimately associated with women. Sitting fearlessly in a solitary place, one should concentrate the mind on Me with great attention.
Purport: 

One who has intimate contact with women and becomes attached to them will gradually lose his determination to go back home, back to Godhead. Association with lusty men gives exactly the same result. Therefore, one is advised to be fearless and to sit down in a solitary place, or a place where there are no lusty men and women committing spiritual suicide. Without fear of failure or of unhappiness in life, one should remain with sincere devotees of the Lord. Atandrita means that one should not compromise this principle but should be rigid and cautious. All this is possible only for one who is ātmavān, or fixed in practical understanding of the eternal soul.