This really depends. If youve recently beaten off to some AWESOME fat girl porn then switch to your weakest hand. Your stronger hand might grip too tight, and itll hurt during rounds 5 and 6 later on that night while your waiting for a MTT to start. If its the first time, id go for the dominant hand, only switching to use the mouse to fullscreen the videos you just streamed. Cheap bastards, you know you all do it. Who pays for porn anymore? Not me. not me.