Guys may get a break when it comes to changing their underwear. Dermatologist Dr. Anju Methil suggests, “In situations with minimal activity and no sweating, changing [underwear] every other day may be acceptable,” adding, “Men’s looser-fitting styles, like boxers, may also allow for slightly longer wear.”
However, women may not be extended the same courtesy as Dermatologist Dr. Archit Aggarwal warns that women with heavy menstrual cycles should consider changing their underwear more than once a day to avoid developing certain infections. Moreso, she adds that “In hot and humid climates, changing underwear even more than once a day might be necessary to maintain good hygiene.”
Source: NY Post