Michael Pollan, in the book Botany of Desire devotes a chapter to marajauna, and suggets that the witches broomsticks and flying was from the use of dildos covered with a mixture of hashish and other botanicals. the mucus memebranes of the vagina would have absorbed many of the chemicals, and even today flying, or higher than a kite, and other phrases are used to describe drugs effects. but i don't think this has anything to do with getting on the stick.