Neither tits or butt necessarily give best hits. Too direct a thumb may scare people off, in fact. Something that shows a cutout part of a nude/semi nude body, a nice curve, or something that looks a lot like cleavage, a flaring thigh or a nice waist - all sorts of things. There is no hard, fast rule for this. In fact, good lighting and color in the thumb also means a lot - logically, since it is an indication of quality and less chance of hitting a dud image. :] Fish