Bum, booty, ass, butt, onion booty, apple bottom, etc., are just a few terms for a woman's posterior. Why so many ways to describe the same thing? I believe it's because the behind is not only aesthetically pleasing, but it also serves a practical purpose. One, it provides nice soft padding for that hottie to use when she sits down for non-sexually related activities. And two, it provides us guys with cushion for the pushin' during those oh-so-fun, sexually charged activities. So comb through our butts reviews and find the right ass site for you.