I too am right handed but had primarily used my left hand to masturbate probably for the same reason as you other guys, the computer. So about a year ago (when I was left handing) while surfing, this huge hard vein popped on the left side of my cock and it didn't go away. I have a great doc, so I went in and asked him about it. I had caused a lymph channel inflammation. He knew how I got it and asked if I had masturbated long and hard - and I had. And I wasn't using any lube other than what I produce on my own. He told me to refrain from sex and masturbation for 10-14 days (not easy since if I don't have sex, I usually jerk off once a day). I did hold off - day 15 was fun - and it took a long while to completely go away. I use my right hand more now and it's actually a bit more enjoyable. Lesson learned, not too hard and have plenty of lubricant nearby!