When you use a public restroom, do you tend to skip the first stall and choose one farther away from the entrance? If you do, you are not alone. Experts theorize that people tend to skip the first stall in favor of stalls farther back to have a little more privacy. But because the first stall is used least often, it contains the lowest bacteria levels. Instead of skipping the first stall, choose it to help avoid possible infections.