These days， only a special kind of lean-and-mean relationship<br >can weather the storms of death， fire， flood--and even the<br >threat of divorce. You can pull these muscular marriages，<br >push them， stretch them to the limit， and they ll still take a<br >little more punishment. In fact， they ll emerge stronger than<br >ever before.<br > I m talking about twosomes that can only be described as<br >tough. This is the fifty- or sixty-year kind that calls for celebra-<br >tions， causes stirring speeches， inspires other couples， and<br >provides total satisfaction， guaranteed for a lifetime.<br > The beautiful thing about such a long-term love relation-<br >ship is this: It s available to everybody. The sad thing is that<br >few people seem to be able to get to first base in achieving the<br >goal. These are rough times for husband-wife ties. Only spe-<br >cial kinds of marriages have any chance of survival over the<br >long haul. Only the most resilient can bounce back after<br >really bad times. Why the failure£¿<br ><br >