Marathon runners and fitness newbies alike know how painful men's chafe can be. Repetitive friction can cause redness or irritation—even blistering or bleeding. Common problem areas are the nipples, underarms and between the thighs, but chafing can occur anywhere friction does. And once the rash sets in, it’s difficult to treat because there’s no convenient way to keep your thighs from touching for an entire week. Here's some easy solutions to keep your junk rash free.