That's not a bad discussion to have, though! What if showering more than two or three times a week causes your back to break out? What if rinsing every other day is good, but using shampoo/soap/etc that often causes unwanted side effects? What if the optimal frequency of showers for keeping body-odor minimized is every third day, and showering every day or every other day actually makes BO worse? We need data!

(I'm not being sarcastic. However, the optimal showering strategy is likely to vary from person to person, and be influenced by diet, physical activity, genetics, environment, etc.)