A cruise on the Pacific goes all wrong, the ship sinks,
and there are only 3 survivors, Bob, Tom and Debbie.

They manage to swim to a  small island and they live there

for a few years, eventually doing what is natural for men

and women to do.

After several years of casual sex, Debbie felt absolutely 
horrible about what she was doing. She felt having sex with 
both Bob and Tom was so immoral and bad that she killed 
herself.

It was tragic, but Bob and Tom managed to get through it.
After a while, Bob and Tom's resistance to natural urges

faded and the inevitable happened.

Well, a couple more years went by and Bob and Tom began to feel 
absolutely horrible about what they were doing.......

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So they buried Debbie.

H/T The Other Woman