Loosley based on the bestselling book of Allan Pease and Barbara Pease, this comedy focuses on typical gender stereotypes, causing difficulties in relationships between men and women. When Jan wants to sleep with Melanie, student Katrin scratches his car's paint. Instead of arguing, he falls in love with her and they finally marry. Meanwhile, his boring roommate Rüdiger is romantically linked to Melanie. However, both couples soon have to fight problems in their relationships...