Survivors Stranded in the South Pacific — Diana Sheridan

What does a straight guy do when he's stranded on a South Pacific island with a gay guy? Nelson and Troy are scientists dropped on Honlera Island for three months of experiments and exploration, but shortly after their arrival, nuclear war breaks out. They're safe on their island, which offers an abundance of food and water, but there's little chance of their being picked up and brought home again. The world outside is in flames, and naturally they cling to each other for comfort and security. One thing leads to another, and soon they're sharing a sleeping bag, and Nelson is finally learning the answer to his question, "Just what do two guys do in bed together?" The seduction scene is exquisite, detailed, and drawn out, as the very willing straight man gets indoctrinated into the wonders and delights of gay sex.