When we pee why do we massage our penises?

When we pee why do we massage our penises?
To Get Rid Of Any Excess Urine I Guess, But I Can't See Any Other Reason Unless He Was Trying To Turn Himself On... =|
what dose it it do?
My GF saw my bestfriend like massageing/stroking his penis when we were peeing off her deck
why do we do that?
while we are peeing not when we r dun

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