Dropping their jeans to do what they need to.

Three young fellas meeting up to go out together when, finding they've got the time, start to get frisky, even though they've done it with each before. And why shouldn't they? The number of possible variations and permutations is huge, even with just three.
Btw: Can't help noticing that at least guy on left has gone commando under his jeans. Sensible fella!