just tell him upfront, you are this desperate 
On serious note, most of the time this situation is created unnecessaraly, and other times, there is a genuine need. For example, X of dulha/dulhan is dying and X want to see “khushiaan of dulha/dulhan” but problem is one of them is not ready (whatever reason job, education ,exams next month whatever hell)…so this is done so that X can die peacefully!
Its hard on guy/gal though. Its just like you are not allowed to drive a car after buying it and getting license although its parked in your driveway !!!