How does the game of Scrabble introduce an element of humor?

Check out this excerpt from GradeSaver,

Of course, one of the major changes to language enacted by the regime is that the use of language has become illicit for women. On the one hand, this lends words and language even more power. On the other hand, it renders the illicit use of language almost sexual. Offred may think so fiercely of words and take such solace in the repetition of memories because doing so helps her to retain her knowledge of language. When the Commander allows Offred to read or plays Scrabble with her, she realizes they are practicing a kind of "kinky" sexual act.