A Breed Apart (1984)

A solitary, unsociable ornithologist lives on a protected island where he cares for the eggs of an endangered bald eagle. An unscrupulous collector hires an expert hunter to steal the eggs. A confrontation unfolds between the two men, set against the backdrop of wild, unspoiled nature.
At the 56-minute mark, Jayne Bentzen and a man are lying in bed, naked and hugging. They have evidently just finished having sex. They talk for a while, then she gets up, showing us a full-frontal nude before getting dressed. At the 77-minute mark, Kathleen Turner has sex in bed with a man. We see the actress naked again a couple of minutes later. She is still in bed with the man, who has his head resting on her breast.