wed-betting
Wagering on how long a newly-hitched couple is gonna stay married. Besides potentially being a significant drain on your financial resources, this unhealthy gambling practice can also reduce bladder-control while you're asleep.
Marriage is a very uncertain thing, so one would have no guarantee of coming out ahead with wed-betting. If it is difficult to resist the temptation just on its own, however, perhaps the prospect of having smelly dampened sheets and blankets could be emporium of a "supplementary" deterrent to prevent you from caving.