The sentence below comes from Mr. Playboy; Hugh Hefner and the American Dream.
A sly sense of humor often lightened the mood. Hefner once quipped to the dignified Spectorsky, “I’ve figured out why you and your wife are so sophisticated. You practice fidelity for kicks.”
In this passage I want to know the meaning of the bold-faced sentence. Let me tell you what I figured out so far.
First, 'sense of humor' say the sentence in question is a humorous expression.
Second, 'fidelity' refers to faithfulness to one's spouse.
Last, 'kick' means an exciting effect, as in I get a kick out of driving fast cars.
Am I right in figuring out the meanings of each word presented above?
Still, I don't get the meaning of the whole sentence. I know it's used for some humorous effect but I don't know why Spectorsky's practicing fidelity for kicks is humorous.