My first thought was "voice recognition software". And then I got to thinking of the proper spelling of random grunts. After that, it all went downhill. If you only press one key at a time, you always have at least one hand free.
Confession time. Although I am a journalist, and active in forums, I have never learned how to type "properly." I have a fast hunt and peck, but it is, and likely always will be, hunt and peck. I do use three fingers per hand. My shorthand is my own version, too. I have unimpeachable notes. No one can read them, including me a month or so later. Voice recognition software doesn't like my combination of accents and slight stutter. I get very interesting things out of it. And Mike, have you seen some of the spelling on these boards?
I'm right handed but I use the left one at times to press the keys. Have never tried using my left hand to masturbate with before.