It's a movie set in the Australian outback, or in australia at least. Where some white people have settled with the native aboriginee people. The one white girl has an affair of sorts with one of the natives. They go to a cave type place where he takes her clothes off and pours sand on her. I watched this movie like ten years ago.

Try these movies this is what I got so far all 52 titles
Sorry wasn't much help this all I got

Category:Films set in Australia - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Category:Films_set_in_Australia)

This sounds like "Walkabout," which came out in 1971. Maybe it was already
An old film when you saw it? Here's a link to a brief description.

Walkabout Synopsis (http://www.fandango.com/walkabout_v115855/summary)

I do remember when I saw it that there was a romantic theme between
The aboriginal boy and the young white girl. The young boy killed
Himself near the end of the movie, as I recall.