It isn't sexual, it is dominance. Ginger does it all of the time when she is excited (by excited I mean overly active or on sensory overload, not sexually). We have a toy named Mr. Bear, that she has always humped, even as a very young pup. It is her way of taking control over something when chasing the ball around the house gets her adrenaline pumping. She has never tried to hump my leg, and only very rarely tries to hump one of her friends when playing rough. Ginger is not a dominant dog by any stretch of the imagination, and I think Mr. Bear is a perfect way for her to release her energy (although it does seem to surprise guests when she does it).
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