Cameron cheats with 2 hookers in Ethan’s room, but Ethan resists the temptation. However, when the girls return from shopping, Harper finds a condom wrapper on the couch, asks Ethan a bunch of times what happened, Ethan lies and says
nothing happened, and when the wrapper is produced, he relents and gives up Cameron, but insists he did not engage, which is true. However, Harper does not believe him and is in a foul mood.
Then when there is an opportunity for Harper to “get even” she hangs out with Cameron, they go up to their adjoining rooms, Ethan gets suspicious, goes up to find the door of his room bolted, pounds on the door until it is opened by Harper. Ethan finds the door to the adjoining room ajar. Suspecting her, he presses, she says
nothing happened, but finally admits that Cameron had kissed her. Now Ethan is pissed as he imagines they had more time than for just a kiss, and he fumes, especially when Harper, no longer glum, is now acting happy.
Daphne alone with Ethan on the beach sees he is troubled, asks, and after Ethan tells her, she drops the line “
do what you have to do to survive”, and then suggests they go check out an island together. We don’t see what happens on the island, but Ethan is happy after they return. So the audience is left to imagine exactly what happened there.