A cruise liner founders and there's only three survivors who get washed up on a deserted island, Bob, John and Debbie.
As time wore on the needs of nature took it's natural course, so the lads started having sexual relations with Debbie.
After two years Debbie started to feel so ashamed of herself she committed suicide.
Bob and John were devastated, bur life goes on, nature again took it's natural course, the guys had urges that needed satisfied.
A year later however they decided to do the decent thing, ... they buried Debbie.