Well, I used to be a big-time caver before I got married and my wife domesticated me. (Plus all my college buddies I used to go with were also domesticated in the same way.)
Body rappels can be very uncomfortable and are best left to semi-steep slopes over short distances instead of sheer drops over long distances. I've never seen anyone try to body rappel a 150' sheer cliff.
I did see someone (one of these big talkers) try to "Austrailian" style (with a swami seat and a running jump) off a 60' cliff once. He was hurting pretty bad when he was done. Good thing that 30' foot tall pine sapling help break his fall, or he may not have had to ever worry about pain again. <img src="images/graemlins/shocked.gif" alt="" />
If you wanna be the big hero, get some extra harnesses... or maybe cut several 20' lengths of rope for swiss seats (yes, that's what they're called). I'm sure someone has put instructions somewhere on the 'net on how to tie them. I'll go find a link that properly explains it if anyone is interested.
Ben Davis (National Speleological Society Member # 32811)