Choose a girl to go first. Sit her down in a room. Turn off all the lights. Have the guys line up and number them off 1,2,3,4, and so on. Have the girl pick a number from 1-how many boys there are. Whatever number she picks- that's the guy who has to kiss her. She may want to keep her eyes closed or be blindfolded if it isn't dark enough. When the lights come on she has to guess who kissed her. If she's right she goes again if not then its another girls turn. Continue the process over and over, constantly changing the order
of the boys. You can also switch and have the girls line up and blindfold a boy etc.