Srimad Bhagavatam Canto 09, Chapter 14, Text 22

SB 9.14.22

ghrtam me vira bhaksyam syan
 nekse tvanyatra maithunat
vivasasam tat tatheti
 pratipede mahamanah
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Urvasi said: “My dear hero, only preparations made in ghee [clarified butter] will be my eatables, and I shall not want to see you naked at any time, except at the time of sexual intercourse.” The great-minded King Pururava accepted these proposals.
Srimad Bhagavatam Canto 09, Chapter 14, Text 21
Srimad Bhagavatam Canto 09, Chapter 14, Text 23