Short answer: no. Follow up: why are we even talking about this? Because apparently, it still needs to be said. During a recent video interview with TMZ, surfer Laird Hamilton—who, to his credit, did some very sound myth debunking by reminding viewers that shark attacks are incredibly rare—stated quite matter-of-factly that "the biggest, most common reason to be bitten is a woman with her period, which people don't even think about that. Obviously, if a woman has her period, then there's a certain amount of blood in the water."