In regard to dpr's writeup, which referred to Venus, one great trick (found in a Playboy article, no doubt) is an interesting form of oral sex. The person who is "down south" blows air through his/her closed lips, resulting in a humming or buzzing sound. The facial lips are applied to the lower lips while this buzzing continues. This practice is referred to as "The Venusian Kazoo". Note: never blow air directly into the vagina, as this can cause harm or at least incredible discomfort.