I wondered why I was able to sneak into this at age 11

I finally remembered to look this up. I had remembered the title since childhood because of the glimpse of Liane. I went twice. :-) Alone. At night. Age 11 or so. It is only now that I see it was released as a G rated film by accident.

These days we are more prudish than in the days when nudist films had certifications due to a Supreme Court ruling. I wonder of this film is around at the dvd stores. Will look.