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I've also peed in a wetsuit... it does work, and the natural flow of water through the suit dilutes the urine relatively quickly. It's not unsanitary. But a teakettle of warm water down the neck of the suit before you enter the water works better.
As for the refrigerator/empty house issue, there's a lot of confusion among the energy efficiency experts because they don't have consistent sets of assumptions (I worked in a related field for 15 years). The heat absorbing mass of a house (i.e. whether it's empty or full) has absolutely NO impact on the amount of energy required to heat a house over time. Thermal storage schemes take advantage of the COST of energy at different times, not the total amount of energy required. It's the same, and is governed by the surface area of the house, the efficiency of the thermal envelope, and the ambient weather conditions.
A refrigerator is the most efficient heater in almost every home that doesn't have a heat pump. It uses a heat pump (condensor & evaporator coils) to pump the heat from what you put inside it back into the kitchen. Relatively little energy is required to do this. You get the same effect by filling a fridge as you do with filling a house. You create thermal storage. A full fridge will stay cooler longer because of the cold (lack of heat) stored in the stuff in it. Overall, filling a refrigerator makes it consume more energy in pumping the heat back into the kitchen.
As for peeing when you're camping, most of the arguments here miss that fact that the human body is not a static one. It is working to maintain a thermal differential against the cold. The more mass you have, the lower your surface-to-volume ratio (and likely the higher your level of insultation). This equates to more efficient heat retention. The extra amount of urine in your bladder would be inconsequential in this equation... BUT peeing is like pouring hot water down the drain. You've expended energy in heating the water, and it's going right down the drain. In the case of urine, although you don't have to reheat anything (the mass is gone), you are losing some heat you've already generated. But given that the body is thermally dynamic, the actual loss is again likely inconsequential.
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