you ladies are going to laugh at me....

[Ponyup]

According to my husband it's a comfort thing. sometimes certain things can cramp there little friend, sitting for example, so they have to put it down one leg or the other. Also my cosmo said they do it to hide erections. I would imagine it'd be similar to having a seam pressing right down on the middle of your boob. If this happened you would 1. remove item of clothing causing this, or 2. move your boob to one side or the other of the seam. Depending on the situation men can't just remove there pants.