when at last the sexual act is permitted and the clitoris itself becomes excited, it still retains a function: the task, namely, of transmitting the excitation to the adjacent female sexual parts, just as—to use a simile—pine shavings can be kindled in order to set a log of harder wood on fire.
Freud’s canonical formulation reduces the clitoris to a transitional ignition mechanism whose proper developmental fate is to yield excitatory primacy to the vagina.
, Three Essays on the Theory of Sexuality, 1905thesis