@weatherwax2010's story about the ripped jeans reminds me of working with a friend a few years ago shoveling and moving dirt. How about I call him James. James is scary tall and seems lightly built but that's because his height and complete lack of fat throw off your perception. He's actually a really big guy. Naked he's a wet dream, toned and lithe with blonde body hair that outlines his body when the sun hits him from behind. He has about the biggest soft penis I've ever seen, easily larger than me hard, with a slightly short foreskin that always shows the tip of his glans and pee hole. I'm not making this up, the guy is a living Adonis. If I were making this up I'd tell you he's gay, but IRL he is straight. He's down to get naked most any time, particularly camping. We've skinny dipped a bunch.
Anyway, the story. Since we're doing yard work James is wearing old jeans and a tee shirt that is a little small. He has a thing for tight pants. So I'm lightly aroused sneaking looks at the shape of his butt when his pants pull tight as he moves, not to mention the skin showing below his tee teasing the top of his ass, not quite showing the top of his ass crack. And then lifting a big shovel load of dirt, his jeans rip. The entire ass seam parts from the crotch to the waistband. The material sort of hangs open and I'm looking at his crack and a couple inches of both ass cheeks. I had no idea he was going commando. He frequently wears really skimpy underwear, so until his pants ripped I didn't think it was odd I hadn't seen a waistband. Let me tell you, he has very fine ass cheeks. He was completely unembarassed. I offered to get him some of my jeans but he said no. He kept working the rest of the afternoon like that, the seat of his jeans flapping open as he walked or leaned over. Whenever I was behind him my eyes were locked on that tear in his pants. Who knew shoveling dirt could be so much fun?