"The distinctive sound is dependent on the elasticity of the sphincter, the presence or absence of hemorrhoids, and the muscle tone of the surrounding flesh. ""Hemorrhoid removal and weight loss can reduce the telltale noise. " http://www.kudzumonthly.com/kudzu/dec02/BreakingWind.html An unrelated fact from the article"Though, based on relative body mass, men do not have more gas than women, they do release more frequently - twelve times per day [b[as opposed to seven[/b] - and are less reserved in the delivery. "