Freud brought out a fact whose importance had not previously been recognized: male eroticism is definitively centered on the penis, while the woman has two distinct erotic systems, one that is clitoral and develops in infancy and another that is vaginal and develops only after puberty; when the boy gets to the genital phase, he completes his development; he has to move from the autoerotic attitude, where subjective pleasure is sought, to a hetero erotic attitude that will link pleasure to an object, usually a woman; this passage will occur at puberty through a narcissistic phase: but the penis will remain, as in infancy, the favored erotic organ.