Just 35% of online consumers pay bills at their bank or credit union's Web site. What about the rest? Citing a preference for check writing and the need for paper bills for record keeping, 71% of non-adopters say they'll never pay bills online. Twenty-three percent of non-adopters plan to pay bills online but just haven't gotten around to it yet, and 6% did pay bills online but quit using the service. But the future adoption picture is not as bleak as it may seem — non-adopters report they could be coaxed into adoption. At the top of their wish list is something any financial firm could easily offer — an online security guarantee.