You know, aside from the confirmed "jade/shian" sp, I don't know of any other sp out there that actually offers BBFS. Everyone else that has been rumoured to offer it has been disproved (or is otherwise playing safe by now, and was just unwise/newb previously).
It may be that 40% have done BBFS in the past, but I'm not so sure how easy it would be for 40% to contunue to engage in BBFS. There just doesn't seem to be the provider support for those numbers. Maybe if the poll was just unprotected sex (as that would include BBBJ, which I could easily see as a 40%+ range)
*shrug* All I'm sayin' is that if 40% of the guys were doing BBFS, you'd think there'd be a few more substantiated accusations on these boards. Of course, if they're going after the desperate girls on the street, maybe that's where the numbers get a big boost from. Dunno. Scary numbers, none the less.