More than once I've noticed that my balls are significantly bigger than usual. I'm in a phase like that right now. Even my girlfriend noticed: a few days ago during foreplay she cupped them and said something like "they're filling the sack more, right?" I checked, and sure enough: clearly bigger and heavier than they had been. This seems to happen when I've been successful at something recently, and when I've had to be more of a leader than usual at work. This latest episode follows my having gotten a job offer and passing a certification test, so it fits the pattern. I gotta say, I like 'em bigger on me They look and, uh, feel better. And the effect tends to last for weeks, although I don't keep track of it. Has anyone else experienced this? On the flip side, how about testicular shrinkage? I guess any number of things can cause that, from medications to stress to illness. Though I haven't had that experience myself.