There are many examples of profanity in science fiction.
Jeff has said that real-world expletives are not allowed on any StackExchange site (presumably including bowdlerized versions, since the question has such as an example), although his answer appears to be regarding using these words as insults (insults in general are not ok, of course), or as emphasis. These words are permitted in technical discussion on the English Language & Usage site, and there may be other site-specific exceptions.
Is it permissible to use fictional-language profanity on this site?
- Is it acceptable in direct quotations, or do those need to be censored?
- Is it acceptable to ask questions about these words? (e.g. "What is the origin of ****?").
- Is it acceptable to simply use these words in questions/answers? (e.g. "This is the ****ing best example of modern science fiction").