Sentence:  Comments merely allow readers to proclaim themselves mortally offended by the content of a story, despite having been warned in large block letters of INCEST or <WSD>SLASH</WSD> (any kind of sex between two men or two women: the term originated with the Kirk/Spock pairing – it described the literal slash between their names). 
Meaning of the word marked with <WSD> tags:  (nodot=1): fan fiction focused upon "shipping", or pairing, characters.