In the aftermath of nuclear apocalypse, 99% of the survivors are sex Negatives - they become violently ill if they attempt to have sex. The minority sex Positives are forced to engage in carnal theater for the entertainment of the Negatives at Café Flesh. Everyone is excited about the arrival at the club of the famous Positive Johnny Rico, and one Negative woman is beginning to question her negativeness as she and her boyfriend grow more distant from each other.

References:
https://en.wikipedia.org/wiki/Caf%C3%A9_Flesh