Well seriously, I don't know how there could be an INcorrect manner for this. I would imagine that any foreskin problems would involve infection of the skin, which would manifest itself in pretty obvious ways. (This is why I'm glad to be cut, avoiding all kinds of messiness and trouble.) As for the urine stream, really, as long as there's no burning or blood then you shouldn't worry about it. Any pressure change would be the same kind of thing that happens when you pinch or bend a garden hose.