In all seriousness... I honestly think that just by investigating your own anus so closely (using your finger as a swab? Timing the effect?) you are definitely worrying about your personal hygiene too much. I'm all for a clean butt - if I can't have a shower immediately after voiding my bowels I'll use baby wipes - but after that I'm prepared to believe I'm as clean as anyone else out there, and if they don't smell offensive then neither to I.
So stop worrying about giving off smells. Anuses are allowed to do that. Anyone getting close enough to notice is probably going to be distracted by the other smells they were probably in that area for anyway. You're normal.