Srimad Bhagavatam Canto 01, Chapter 10, Text 28

SB 1.10.28

nunam vrata-snana-hutadinesvarah
samarcito hy asya grhita-panibhih
pibanti yah sakhy adharamrtam muhur
vraja-striyah sammumuhur yad-asayah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
O friends, just think of His wives, whose hands He has accepted. How they must have undergone vows, baths, fire sacrifices and perfect worship of the Lord of the universe to constantly relish now the nectar from His lips [by kissing]. The damsels of Vrajabhumi would often faint just by expecting such favors.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
Religious rites prescribed in the scriptures are meant to purify the mundane qualities of the conditioned souls to enable them to be gradually promoted to the stage of rendering transcendental service unto the Supreme Lord. Attainment of this stage of pure spiritual life is the highest perfection, and this stage is called svarupa, or the factual identity of the living being. Liberation means renovation of this stage of svarupa. In that perfect stage of svarupa, the living being is established in five phases of loving service, one of which is the stage of madhurya-rasa, or the humor of conjugal love. The Lord is always perfect in Himself, and thus He has no hankering for Himself. He, however, becomes a master, a friend, a son or a husband to fulfill the intense love of the devotee concerned. Herein two classes of devotees of the Lord are mentioned in the stage of conjugal love. One is svakiya, and the other is parakiya. Both of them are in conjugal love with the Personality of Godhead, Krsna. The queens at Dvaraka were svakiya, or duly married wives, but the damsels of Vraja were young friends of the Lord while He was unmarried. The Lord stayed at Vrndavana till the age of sixteen, and His friendly relations with the neighboring girls were in terms of parakiya. These girls, as well as the queens, underwent severe penances by taking vows, bathing and offering sacrifices in the fire, as prescribed in the scriptures. The rites, as they are, are not an end in themselves, nor are fruitive action, culture of knowledge or perfection in mystic powers ends in themselves. They are all means to attain to the highest stage of svarupa, to render constitutional transcendental service to the Lord. Each and every living being has his individual position in one of the above-mentioned five different kinds of reciprocating means with the Lord, and in one’s pure spiritual form of svarupa the relation becomes manifest without mundane affinity. The kissing of the Lord, either by His wives or His young girlfriends who aspired to have the Lord as their fiance, is not of any mundane perverted quality. Had such things been mundane, a liberated soul like Sukadeva would not have taken the trouble to relish them, nor would Lord Sri Caitanya Mahaprabhu have been inclined to participate in those subjects after renouncing worldly life. The stage is earned after many lives of penance.
Srimad Bhagavatam Canto 01, Chapter 10, Text 27
Srimad Bhagavatam Canto 01, Chapter 10, Text 29