Shrinkage
Like your increased potential for E.D. you can also see a reduction in size. This is because those spongy, fibrous membranes that become engorged while aroused can slowly stretch out over time, creating the potential for little Jimmy to have a growth spurt. Stop having sex (with another and/or yourself) and those membranes go back to their normal, less than spectacular selves. Little and limp… ouch…