The yakuza is Japan's version of the mob. When imprisoned, yakuza members practice pearling, otherwise known as genital beading. For every year spent in prison, a yakuza inserts one pearl under the surface of his penis, creating a series of raised bumps -- hence: "speed bumps." Filipino seamen are known to engage in the practice, too. But why would a guy want to put beads in his skin flute? The sailors say: "[It] makes the women enjoy sex more." According to one sailor-lover, the inserts "add a little something extra."