I'm looking for a book about a human man who, along with a human woman, is forced to fight against aliens who are described as being a golden man and woman, very strong, beautiful and "superior".
I read it in 1979-1981, I would like to read it again but I cannot remember the title. I believe both the human couple and the alien couple were abducted by another group of aliens.
What you are describing appears to be Transit by Edmund Cooper (1964).
A synopsis from goodreads.com:
Plot: Richard Avery is on auto-pilot after his one true love dies young of cancer. He gets whisked off by a mysterious someone, and plopped on a planet with three other people. We get, that start a 'Robinson Crusoe in space', but it turns out that there are 'golden ones' who have a similar colony of four on the same island, and they're not friendly.
