CC Ādi 4.162

gopī-gaṇera premera ‘rūḍha-bhāva’ nāma
viśuddha nirmala prema, kabhu nahe kāma
Word for word: 
gopī-gaṇera — of the gopīs; premera — of the love; rūḍha-bhāva — rūḍha-bhāva; nāma — named; viśuddha — pure; nirmala — spotless; prema — love; kabhu — at anytime; nahe — is not; kāma — lust.
Translation: 
The love of the gopīs is called rūḍha-bhāva. It is pure and spotless. It is not at any time lust.
Purport: 

As already explained, the position of the gopīs in their loving dealings with Kṛṣṇa is transcendental. Their emotion is called rūḍha-bhāva. Although it is apparently like mundane sex, one should not confuse it with mundane sexual love, for it is pure and unadulterated love of Godhead.