I'll never forget Barbarella. I was 12 or 13 years old, and visiting my favorite uncle, an optometrist who joined up and was a Major in the Air Force, at Dover Air Force Base in Delaware. Barbarella sounded like an intersting SF movie so he took me out to see it on the base (this was before the rating syustem was installed). Jane Fonda was the first naked lady I ever saw onscreen. My Uncle Fran was a bit embarrassed that he took me after it turned out to be so sexual, but pretty much shrugged it away with a chuckle.

And to add to the list:

Dr. Zhivago