NBC accidentally showed nudity during a women's water polo match between the United States and Spain at the Rio Olympics.

Liu Ping of China, right, moves her head back as Federica Radicchi of Italy reacts to contact during their women's semifinal fifth to eighth place water polo match at the 2012 Summer Olympics ...

For a sport that includes 'brutality' in its lexicon, water polo lives up to its physical reputation, but it isn't all dirty underwater tactics.