There is a full-on kiss between two soccer players on the pitch, but this one takes place in the popular soccer video game "FIFA 12." From Kotaku:
Some might call this a fluke, a twist of fate—a coincidence. Striker Andy Carroll makes his way down the pitch, tries to score a goal and ends up (accidentally?) scoring with Arsenal's keeper. The keeper of kisses.
Not sure why the goalie would want to kiss a guy who just scored on him, but maybe he's into shooters. Video: