And where in the entire body of everyday natural instinctively useful objects, are things that respond to and are manipulated by caressing them precisely with j

And where in the entire body of everyday natural instinctively useful objects, are things that respond to and are manipulated by caressing them precisely with just the tips of your fingers? Well, sex obviously, but having sex with a large square piece of glass isn't at all enjoyable. Kind of explains the popularity of thinkpads' nipple mouse, though.