Youre over-generalizing. I had several crushes by age 6. I admired pretty girls that werent too prissy. I played show me yours and Ill show you mine with a couple of them. I didnt really know what sex was for another year or two, but knew what relationships and dating were and wanted go out with girls like then once I was a teenager. I dont think that I was that unusual.
Yes, let me state myself clearer: Six year olds COMMONLY do not have interest in girls.
I myself have had to listen about embarrassing stories about me and a certain girl I liked when I was five.