I am ambidextrous in most things - I can write with either had, but naturally use my left more, I use most tools (brushes, scalpels and craft knives, screwdrivers etc) with eithe rhand, depending on angle of access.
When pissing, I generally use my right, but only because clothing is biased that way - getting your left hand into a trouser fly is harder than getting your right in, because of the direction the flaps of cloth are facing.
If I get up in the night (and have nothing on) I use my left - i use my right to lift the washing up bowl out the way
For aiming the pink torpedo up Tuna Canyon I use either hand as situation dictates and access allows.