I realized man has five fingers on each hand for the purpose of picking at various popular orifices. The most commonplace picked-at areas on the body are the nose, the ears, the teeth, the eyes and the butt. The importance of having five fingers is so that each finger can be designated a certain picking area so there is no overlap. It is quite unsanitary to pick away the eye boogers of rest with the finger used previously to idly pick at your butt. It also would not please many to discard a popcorn kernel lodged in between teeth with the same finger used to clear away waxy buildup of the ear. With five fingers, however, each individual finger can be assigned a part of the body to pick at, so that each finger covers the necessary ground. Typically people tend not to pick at areas other then the aforementioned five; if they do they must prepare for overlap, or perhaps migrate to the other hand for extended picking purposes. So long as each finger is given a specific area, there need not be concern for cross-pollinization of fluids, as each finger is carefully seperated by the one next to it by a bit of space and a tinge of webbing. If we stick to the designated areas, our picked areas need never be in direct conflict with one another.
And be sure to wash your hands early and often.