Wedding in White (1972)
A young girl's brother comes home from the army, and brings an army buddy with him. The three of them go out that night to celebrate, and after much drinking has been done, the brother's friend rapes the sister. After the two men have gone back, the girl finds that she's pregnant--and discovers that her parents don't blame the soldier, but blame her.
Directed by: William Fruet
Starring: Carol Kane, Donald Pleasence, Doris Petrie, Leo Phillips, Christine Thomas, Paul Bradley
Links: IMDb, Movie posters, Movie stills