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Aside from being spectacular on toast, crackers, Wasa bread, etc., honey can be used to increase friction during intercourse. According to The Joy of Sex honey is harmless to the female sexual and reproductive organs and washes off with water.
Personally, I don't know why anyone would want to increase sexual friction, but I suppose I shouldn't knock it if I haven’t tried it. If one were to practice this they would need rubber sheets, though.