The fashion for an out-there derrière, as made famous by J-Lo has prompted a market for silicone implants in the buttocks. Women (or is it their boyfriends?) want their bottoms high and round. An incision is made in the centre of the lower back, and the implants are placed behind the gluteus maximus muscle. Does it hurt? You'll be uncomfortable and bruised, have to wear a support garment for at least two weeks and must carry a soft cushion everywhere - not very J-Lo. Why have it? If your rear end is hopelessly Anglo-Saxon (flat) and no amount of "buns...