If I am in the water and I need to pee, I'll just let go right there and then but if I'm out of the water, especially if the wetsuit is dry, it is much more exhilarating knowing that I could get caught. Also, it feels more like wetting if the wetsuit is dry, instead of just like peeing in the ocean which isn't exciting to me. You should totally try peeing in your wetsuit on sand. You'd be surprised by how discreet it can be if you go slowly. Especially if you are wearing a thicker 4/3 wetsuit instead of a 3/2 wetsuit