Today, I learned that I'm not ambidextrous, but Cross-dominant (it sounds awkwardly too much like "cross-dresser").
I was only left handed, but in elementary school, my teacher used to slap my left hand with a ruler whenever she caught me writing with it, so I learned to write with my right hand, and forgot how to write with my left.
I use different sides to different things, like:
Left: Self-gratification

eek

, playing soccer, mouse, spoon-knife-fork, etc...
Right: Playing guitar, writing, wiping my ass, scissors, bat.
Both: Opening jars, teeth brushing, and pretty much everything else.
I too think that living in a right handed world, made us lefties cross-thingies. (that sounded awful).