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>Many Filipino sailors make small incisions in their penises and slide tiny plastic or stone balls -- the size of M&M's -- underneath the skin in order to enhance sexual pleasure for prostitutes and other women they encounter in port cities, especially in Rio de Janeiro. "This 'secret weapon of the Filipinos,' as a second mate phrased it, has therefore obviously something to do," Lamvik wrote in his thesis, "'with the fact that 'the Filipinos are so small, and the Brazilian women are so big' as another second mate put it."