I always pee in rentals
I never pee in my own suit
If I do pee I always take off the wetsuit in the water and rinse thoroughly.
tips for new divers;
1. pee before you put on your wetsuit and get in the water - if your properly hydrated - this should be no problem
2. pee during your surface interval - more hydration no problem
3. boat ladders double as a pee station- pull the wetsuit to your knees and release
4. pee if you must, holding pee is not healthy - see below
5. if you must pee, pee in the beginning of the dive
6. try rinse methods previously listed, shorties are easier
7. everyone pees and believe me, your fellow divers will appreciate the rinse
8. not really easy to hid if you do come aboard with a pee suit
scuba apparrel websuits are about to get a spike in wetsuit sales no doubt.