Sexual Chicken
Like the game of regular chicken but slightly sexual.

Two people (same-sex or opposite sex) who are usually just friends flirt, make gestures, and make physical contact with each other. Each comment, gesture and touch more sexual than the last. And who ever gets creeped out first and calls quits, loses.
Jack: I like your eyes *brushes hair out of face*
Jane: I like your butt.
Jack: Touch it then..
Jane: Fine, I will.. *approaches butt with hand* ... No!! I can't! I quit!!
Jack: Yes!!! I win!! I'm the master of sexual chicken! By the way.. you owe me lunch tomorrow.