My <strike>pants</strike> trousers ALWAYS develop large holes in the crotches far before any other part of them shows any type of wear. While the added ventilation can oft-times be nice, this is generally undesirable for a number of reasons. When the holes are small it's not too bad, but the holes very rapidly increase in size until there's simply nothing left; my trousers become nothing more than hinged legs. This phenomenon is apparently also experienced by Gary as well.
I can't speak for Gary, but I know that in my case, at least, the problem is not undue stresses being put upon the inside of my trousers -- if you know what I mean. There are many aspects of my life that cause undue stress and pressure, but the contents of my trousers are sadly not among them. No, the cause of these holes is a much more mysterious one; I fear I may never get to the bottom of it.