The Sex drive (n.) has been suppressed since childhood more than any other, and so leaves behind more and stronger unconscious wishes ready to make dreams.
The Sex drive (n.) are extraordinarily plastic, like a network of communicating channels filled with liquid: frustrate one and another may carry its full load.
The Sex drive (n.) is hard to educate because at first it needs no object: it lives like a parasite on other functions and stays self-willed, "unreasonable", for life.
The Sex drive (n.) begins as many independent hunts for organ-pleasure, enlisted in reproduction only late, and able to swap objects so readily that it can be sublimated.
The Sex drive (n.) is educated to reality late, held back by childhood's self-sufficiency and the latency years, and that delay is a seed of neurosis.