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PG-13 movies are allowed two uses of the word "fuck." The Martian had Matt Damon use them fairly early on, first, when Watney yanks the piece of the antenna out of himself ("FUCK!"), and second, when he makes up his mind to survive ("Fuck you, Mars"). They allude to its use in many other places, though, such as the memorable shot from outside the Rover where you can clearly see his lips saying "What the fuck? What the fuck?" Then there was some "censored" text in the chat logs, a reference to Watney telling the botanists to "have sex with themselves," and so forth.