Poon tang. This term is used mostly on a basis of possibility, not what could never be. For example, looking at a girl at the beach the same age as you would be desiring the nectar. looking at Jenna Jameson's twat in a porn and calling it nectar would be completely inacurate.
Hey, Woogie, look at that hot piece of ass over there. I sure do desire a slice of that sweet Nectar from that.