The tattoos of US swimmer Anthony Ervin are pictured before the swimming event at the London 2012 Olympic Games on August 1, 2012 in London. AFP PHOTO / LEON NEAL

A tattoo on the left arm of Sweden's pivot Andreas Nilsson is seen during the men's preliminaries Group A handball match Great Britain vs Sweden for the London 2012 Olympics Games on July 31, 2012 at the Copper Box hall in London. AFP PHOTO/ JAVIER SORIANO

A tattoo on the left arm of France's leftwing Samuel Honrubia is seen during the men's preliminaries Group B handball match Argentina vs Frajumps to shoot nce for the London 2012 Olympics Games on July 31, 2012 at the Copper Box hall in London. France won 32-20. AFP PHOTO/ JAVIER SORIANO

A picture shows the tattoo on Italy's Federica Pellegrini's ankle as she stands on the starting platform at the start of the women's 200m freestyle heats swimming event at the London 2012 Olympic Games at the Olympic Park in London on July 30, 2012. AFP PHOTO / MARTIN BUREAU

TOPSHOTS An athlete's Olympic rings tattoo is seen during the swimming event at the London 2012 Olympic Games on July 29, 2012 in London. AFP PHOTO / LEON NEAL

Italian gymnast Vanessa Ferrari bends to pick chalk lying on the ground during the artistic gymnastics women's qualifications at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Matt Dunham)

A tattoo of the Beijing 2008 logo is sported on the back of Tamas Varga of Hungary as his team plays against Serbia in a preliminary water polo match at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. Serbia won 14-10. (AP Photo/Julio Cortez)

A young woman wears a London Olympics logo on her cheek outside the Olympic Park ahead of the 2012 Summer Olympics Opening Ceremony, Friday, July 27, 2012, in London. (AP Photo/Matt Rourke)

Olympic male swimmer with Olympic rings on his back during the morning practise session at the Aquatics Center in the Olympic Park in London on Friday, 27th July, 2012. LEHTIKUVA / Heikki Saukkomaa *** FINLAND OUT. NO THIRD PARTY SALES. ***

U.S. swimmer Dana Vollmer sports a tattoo of the Olympic rings during a practice session at the Aquatics Center at Olympic park ahead of the the 2012 Summer Olympics, Thursday, July 26, 2012, in London. (AP Photo/Michael Sohn)

British athlete Nicholas Robinson Baker's tattoo is seen as he dives during a training session at the Aquatics Center in London on July 26, 2012 on the eve of the official opening of the 2012 London Olympic Games. AFP PHOTO / FABRICE COFFRINI

The Olympic rings tatooed on the ankle of France's Camille Muffat are pictured during a training session, on July 25, 2012 at the Aquatics center in London, two days before the start of the 2012 London Olympic games. AFP PHOTO MARTIN BUREAU

France's Laure Manaudou is pictured during a training session, on July 25, 2012 at the Aquatics center in London, two days before the start of the 2012 London Olympic games. AFP PHOTO MARTIN BUREAU

A tattoo is pictured on the back of a swimmer during a training session, on July 25, 2012 at the Aquatics center in London, two days before the start of the 2012 London Olympic games. AFP PHOTO MARTIN BUREAU

A tattoo is pictured on the back of a swimmer during a training session, on July 25, 2012 at the Aquatics center in London, two days before the start of the 2012 London Olympic games. AFP PHOTO MARTIN BUREAU

The tattoo of a swimmer is pictured during a training session, on July 25, 2012 at the Aquatics center in London, two days before the start of the 2012 London Olympic games. AFP PHOTO MARTIN BUREAU

The tattoo of a swimmer is pictured during a training session, on July 25, 2012 at the Aquatics center in London, two days before the start of the 2012 London Olympic games. AFP PHOTO MARTIN BUREAU

The Olympic rings with the logo of the Beijing 2008 Olympic games are tattooed on a swimmer during a training session, on July 25, 2012 at the Aquatics center in London, two days before the start of the 2012 London Olympic games. AFP PHOTO MARTIN BUREAU

The Olympic rings are tattooed on the neck of a swimmer during a training session, on July 25, 2012 at the Aquatics center in London, two days before the start of the 2012 London Olympic games. AFP PHOTO MARTIN BUREAU

France's Amaury Leveaux attends a training session on July 25, 2012 at the Aquatics center in London, two days before the opening ceremony of the London 2012 Olympic Games. AFP PHOTO / MARTIN BUREAU