World Cup 2014: Which 4 Countries Impose Total Sex Ban on Soccer Players Competing in Brazil

South Korea's Ki Sung-yueng controls the ball during a friendly soccer match against Tunisia at the Seoul World Cup stadium in Seoul in this May 28, 2014 file photo. South Korea's squad will make their eighth consecutive World Cup appearance in Brazil, where they have been drawn with Russia, Algeria and Belgium in Group H. REUTERS

Victories by some national soccer teams competing in the current World Cup games in Brazil has led some porn stars to either abstain or indulge in sex.

Read: World Cup 2014: Female Porn Star Marlen Doll Celebrates Chile Win Over Australia by 12-Hour Sex Marathon with Strangers

Among athletes, it has been a common belief that indulging in sex prior to a game could affect the results of their match, thus some teams impose an abstinence rule on their players. Thus, prostitutes flock in droves to international sporting events because of income opportunities.

E! Online reports that four national soccer teams have imposed a no-sex rule on their World Cup players. These are Russia, Mexico, Chile and Bosnia and Herzegovina.

On the other hand, Germany, Spain, the U.S., Australia, Italy, the Netherlands, Switzerland, Uruguay and England allow their players to engage in sex.

For some teams, there are certain conditions that may sound unusual. France allows it players to indulge in sex, but it shouldn't last all night. Nigeria permits it, if the players sleep with their wives only, girlfriends excluded. Brazil okays pre-game fun, but "it shouldn't be acrobatic."