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Along with my ex-wife we have actually measured the longest I have ever been able to shoot. It was about 7 feet horizontally. I would often have mishaps when she was giving me hand jobs because she would forget and it would end up on the wall at the head of the bed. I also do a lot of kegel exercises which seems to be what contributes to this ability.
Also, you seem to imply a correlation between size and distance. I do not believe there is one. I dont really want to mention precises measurements as it always seems vain to talk about ones own penis size. Internet inches seem to be much shorter than real inches as well! haha Anyhow, I have been told I was "huge" though Im not sure by what standards I was being meaured. Its not as glamorous as it might seem, however. Its quite annoying in fact, but thats beside the point.
Point is, I think it has much more to do with the Kegel exercises than the penis size itself. Or any other factor for that matter.
Time is too slow for those who wait, too swift for those who fear, too long for those who grieve, too short for those who rejoice, but for those who love, time is eternity.