I tens to use my right hand on myself and the left is more for nipple play etc, but on the other half it's just whichever has the best angle! I usually end up swapping hands on him at some point anyway.
I'm left handed, and for myself I tend to use my right. Me playing with her, I tend to use my left; and her playing with me, she tends to use both (not as boastful as it sounds - she uses 'em alternately!).
I'm right handed so if I want a very quick wank I use this hand. If however I want to take time over the wank I use my left hand.
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I'm SO glad i'm not the only person who does this! I almost always se my left hand to wank with. unless i'm using a butt plug, then i use my right hand for the stroking, and my left hand for the plug. I dont know why, but i cum quiker with my right hand. As for wanking off others... well, i only did that a couple of times a decade ago, and as i remembe,r i used my right hand. (apparently, i'm not very good at giving hand jobs). And I almost always use my right hand when i'm pleasuring a woman. (apparently, i give excellent , err, finger jobs!)
Right handed, and wank with the right too (left just can't keep up the pace!)... although it has had the result that I can operate a computer mouse with speed & perfect accuracy with my left hand
Both myself and OH are left handed and we both use our left hands to masterbate with i can use my right hand at times but OH cant he just uses his left xx