My dad would do yard work in running shorts. Just running shorts. My mom hated it. Dad was of the generation that was pragmatic (it was hot) and male semi-nudity wasn't really nudity (at least that's what I think at this moment, ask me again in five minutes and I will have a different opinion). I remember a few times being with him as he fixed the lawnmower on the front lawn and as he crouched to fiddle with a spark plug or adjust the carburetor, his dick would flop out. I don't recall if there was a reaction to the floppage, he probably didn't realize it and kept working to get the damned lawnmower started so he could finish mowing the grass.