UNDERWEARS

How often should we change our underwears? Today we have all manner of underwears, briefs, boxers, g-strings(thongs), cyclers, bras, singlets etc but the question still remains, how often do we change them. I've observed that a lot of people especially the men wear theirs for quite some days before washing, women are mostly guilty when it comes to bras but some are equally like most men, they repeat it. What about stockings? this is even worse because you wear your stockings for hours and then remove it, put it in your shoe only to repeat it again and again until it really stinks.
I believe we should change our underwears daily, at least twice a day. Never repeat your boxers, briefs or thongs. The same goes for bras and stockings. You will not only ward off infections by doing this but also maintain freshness always.