If you have an athletic body, you will have an ass. If he doesn't, one can assume he, well, doesn't. Hence my advice (which I very much need to take, myself, but that's another matter). Hrm, I haven't been too athletic for a while but for the past 2 years or so I've been jogging almost 2 miles nightly. Maybe its more of a problem of me buying jeans that are a bit too big in the waist.