i used to hang out in the men's room at a rest area on the interstate near my home. someone had thoughtfully drilled a hole in the stall wall, and when sitting on the toilet, you could see the five urinals, and the cocks of all of the men pissing into them. i spent many,many very happy hours sitting in that stall watching men piss (and occasionally jacking themselves off) while stroking my cock. i'm voting for big cock/loud piss. it's more of a guideline than a rule, but many of those big dicked guys had some big streams of piss. i'd sit there for hours, stopping myself from cumming until some really hung dude would pull out his big cock and begin pissing, then i'd let my load fly! good times!!