Not that I have anything against auto-eroticism, but I was thinking more along the lines of listening to "oldies" like the Beach Boys while washing the car in the sunshine, or doing something else that makes you feel that life is pretty good! LOLWearing a walkman while taking a walk or jogging - riding a bike - even mowing the lawn is fun when the weather is nice.
Or perhaps listening to a classical CD while sitting in front of a winter fire and toasting marshmallows or popping corn?
There are just so many things I would rather be doing than sticking my fingers in my ears, or my eyes, or my nose, or even my mouth! LOL
As you said, there are some more pleasant things that can be done with the hands -- but let's keep it clean here! ha ha