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Mike - I agree. I feel that my bladder empties considerably more freely and completely when I stand to urinate. Perhaps it's the gravity effect?
That reminds me of an old Virginia Supreme Court opinion of the late 1880s in an appeal from a conviction of an 85 year old man of rape, in which the justice, in overturning the conviction, wrote that the "only reason for a man of that age to have a penis was to connect his bladder with the outside air! " (Can't recall the case citation, but it's in the books! )
Urination Technique
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This is strange to me, as I actually find the opposite. If I stand up to urinate, I find it easier to and at the same time seem to empty my bladder more. It's still not perfect but it's a considerable improvement I find.