Plane-Wrecked - Sharing my Wife on a Desert Island, #1

Justine and Paul are on a trip to a Christmas party on the island of Tahiti when the charter plane goes down in a storm. They become stranded on a tiny desert island with others from the office. All three other survivors are men and the alpha-male of the group is uninjured and takes control. Without any contact with civilisation, it's up to the survivors of the plane-wreck to make do in a small cabin with limited supplies.
The men all assume roles in the survival plan. Justine, being the only female, begins to assume a role herself. One of taking care of the men as best she can. Her husband must face reality and accept that his wife quite rightly wishes to tend to these other men as well as him.