"Creatures are not born with desires unless satisfaction for those desires exists.A baby feels hunger: well, there is such a thing as food. A duckling wants to swim:

well, there is such a thing as water.  Men feel sexual desire: well, there is such a thing as sex.  If I find in myself a desire which no experience in this world can satisfy,  the most probable explanation is that I was made for another world." C.S. Lewis