But it's not that practical while bike riding for a number of reasons:

You have to get your shorts down pretty far to get everything positioned right.

You have to have a pretty full bladder in order to be able to start without dribbling.

You have to be able to cut off the stream completely the second you are done in order to not drip.

It _is_ a cool way to impress your friends, though :-) And the best place to learn this skill is in the tub or shower.

Nanci