For me it started at Age 5, most of us r nt aware tht evn at tht age it is a sexual thing.....u might have observed tht sumtimes evn infants get erection lol...newaz jess like most of us I had no clue y I liked it at tht time, bt got a boner whn a much older gal piggy backed me......n sad thing is she did nt lift me again, coz I remember she put me down aftr my organ was poking her back lol.....newaz as a teenager I saw 1 of the american ballets whr the lady carries the guy in middle n at the end of the act, I think I was arnd 12-13