How to change my preferences?

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In some discussions I've looked at, a few posts are marked with 'this comment contains mature content. please change your preferences to allow for viewing.' Or something along those lines. I went to my preferences link but couldn't find an option to turn mature, adult content on. I'm not looking to fill my eyes with dirty words, but sometimes it's annoying when I see a comment that has four or five comments after it and I have no idea what they are talking about! Thanks in advance!