Castaway (1986)

Castaway is a 1986 drama about a man who advertises for a woman to share his life on a deserted island, and Amanda Donohoe plays the stranger who takes him up on the offer. The isolation setup gives her nowhere to hide on screen, and this hub holds 2 scenes that show it. One clip catches her fully nude on the island itself. The other is a sex scene between her and her co-star.