If it's a dedicated whack-off session I use my right hand.  If I'm just a-pullin' and a-squeezin' on myself while viewing webporn of the clip sort, then my left hand is the hand I most rely on because I need my right to use the mouse.  If I'm viewing vid/clip porn of varied lengths, I'll switch back and forth.  If it's a longer format then I'll usually have both hands down in my junk, trading of which is primary and support.  If it's pics, once again it's a mix sort of thing: if I'm bouncing thru a trove of pics that I'm familiar with, I'll just click and pause then go to the next, over and over until I find something that provokes a keener and-or fresher interest from me. If the bondage technique is especially cruel and the rope work well executed, then I might stall out on that image for quite a while- especially if it's new to me- and I'll have both my hands hard at work while I "figure out" the new image, placing myself as the bottom and adding elements to the fantasy until I've caused as much "damage" to myself (my imaginary self) that I can take and then view it as a top and how I got that poor, sorry little, dumbfuck- step-by-step- into that precarious and pitiable position and how I can make it even worse for him.   :cheesy2:

HI!  My name is whatever the fuck you want it to be.

In other news, originally I was an "other" as far as this poll goes, then I was what you might call ambidextrous but then (purely by coincidence) when home computing (sure I was there in the early days of internet porn acessing images via a bulletin board but at work so…) broke onto my scene and my right hand became occupied manipulating the dream machine I became exclusively south paw.

In fact, at this point I don't believe my right hand even remembers how it's done & if it does brush against me down there my dick usually thinks something like "Oi what's this?" LOL