For: an even number of girls and boys
What you need: strings
It’s very important to have an even number of girls and boys to play this game.
Line up the guys on one side and the girls on the other across from each other. Get an even length of string for each girl and boy pair and have them put one end in each of their mouths. When the game starts, everyone has to chew the string, this way every pair will start getting closer to each other. The first pair to get to the middle and kiss wins!