Sex is so overwhelmingly present in the material world that the question must arise, "Where has this sex desire come from?" The answer is that sex originates from God. In the spiritual world, Krishna and His consorts are spontaneously attracted to each other and engage in pastimes of love together. This is called adi-rasa, the original and real sex desire, the super most platform of spiritual exchange. This adi-rasa is free from all material contamination, and is as different to mundane sex attraction as gold is to iron. (SB 5.25.5)Devotees who are without a trace of any mundane desire and who are situated on the highest platform of spiritual understanding, such as Shukadeva Gosvami, Rupa Gosvami, have appreciated and glorified this adi-rasa.Indeed, Krishna Himself accepts the form of Lord Chaitanya, adopting the mood of Shrimati Radharani, just to taste the full sweetness of this adi-rasa.When this incomprehensibly elevated service mood is perverted and twisted by souls envious of Krishna's enjoyment, it comes out as nasty mundane sex desire,which is real cause of all sufferings.