When it comes to the World Cup, teams will do -- or not do -- just about anything to gain an advantage. Whether it's dictating how a team plays during games or how it plays between them, national team managers make the rules. In hopes of increasing the number of goals on the field, some teams prohibit players from scoring off of it.

"We will not be looking for sex or having sex at the World Cup just to have it," Mexican national team coach Miguel Herrera told Reforma in May. "We are going to go after what we came for."

Herreras' no-sex philosophy, one shared by many boxers who famously abstained from sex before big fights, is not something that all coaches buy into. Some of the 32 teams in Brazil for the 2014 World Cup have no such bans. Some of the teams, notably the hosts, take a more nuanced view of what kind of sex is truly safe for players to have before some of the most important games of their lives.