I've just always felt it, even before the onset of puberty. However, I also believe it is a "learned" longing and my individual story is similar to those of my predecessor posters here, though I cannot pinpoint a specific individual or incident as having incited it. Probably such a stimulus resides so far in my past that it is before any time I can recall. Nevertheless, the essential mechanism is the same as for any other fetish--the early association of an object with pleasure, subsequently reinforced by other encounters....