A foul 45 percent of Americans have worn the same pair of jocks for two days or longer, a new study has found. The survey by underwear company Tommy John asked 1,000 men and women about their hygiene habits. And the results were rank. Nearly half said they’d worn the same underwear at least two days in a row — while a hygiene-hating 13 percent of people said they’d worn the same pair for a week or more. The underwear company conveniently argues you should swap out your old underwear for a new pair every six months to reduce your risk of bacterial and yeast infections. At least 85 percent of respondents said they didn’t know how long they’ve owned their oldest pair of intimates. Men are two times more likely than women to wear their underwear for more than a week, the study claimed.