This comedy starring Chevy Chase, Beverly D'Angelo, Imogene Coca, among others is one heck of a comedy. It's beyond funny, it keeps you watching, and even anticipating what Clark Griswald will do to ruin his vacation to Wally World even more. I recommend this movie to children 14 and up because of the nine-time usages of the F-word. However, most of them were meant to be totally comical except for the three where Clark is yelling at his family. There were no uses of it sexually. The language was what really put this movie in the R category. The overall theme is suitable for all ages but nudity was also present. Beverly D'Angelo is seen briefly topless in 3 scenes one of which is jumping into the public motel pool. Also Audrey accepts marijuana from Cousin Vicki who grew it on her farm. She is seen briefly smoking it. Other than that, the sexuality is more on the lines of PG-13 as well as the violence involving a gun (supposed to be comical). Overall, it really was mild for an R and deserves a rating between PG-13 and R (if there really was one).