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However, the epidemiologic literature on type of underwear, as a proxy of scrotal temperature, and male testicular function is inconsistent. Recent adverse trends in semen quality and testis cancer incidence among Finnish men. More recently, a study looked at men during a year-long period of trying to conceive. Jorge Chavarro, associate professor of nutrition and epidemiology at Harvard T. Mobile iPhone, Android apps Tablet apps. Are boxer shorts really better?