I keep getting sent to X rated websites for no reason?

This is very irritating, because A. It interrupts me when I am trying to read. Articles, and B. I am a teenage girl who really, really doesn’t want to see that kind of stuff. Is there anyway that I can stop the redirects?
Update: People keep mentioning that other people must be using my computer to go to those kind of websites. This is not the case, as it is my personal laptop, as we also have a family computer, so no-one uses mine, nor does anyone in my family watch porn.
Update 2: If someone is giving a thumbs down to every answer: Stop it. Some of them genuinely sound helpful!
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