Sony will play its Sex Tape one week earlier this summer. The comedy starring Cameron Diaz and Jason Segel will open on July 18 instead of its original release date of July 25, the studio announced Friday. The film reunites the Bad Teacher co-stars with their director, Jake Kasdan. It follows a couple who make a sex tape, only to discover that it has gone public. They go on a mission to reclaim their lost footage, leading to even more trouble. Rob Corddry, Ellie Kemper, Jack Black and Rob Lowe also star.