Not sure if this is the correct forum to place this but this seems to be the place where everone comes for BF estimates. I remember reading an article from Negrita Jayde about a dozen years ago and found a synopsis of the piece here. (If anyone has the whole article feel free to PM me with it).

This will be a real eye opener for some.
http://www.podarco.com/fitness/content/view/65/96/