What Do the Hosts Compare the Duchess's Tongue to in Belinda Blinked?

In "Monday Morning 7.45am," the Duchess licks Belinda Blumenthal, and Rocky Flintstone writes that her tongue "snaked" from Belinda's breasts down to her pubic hair. Jamie, James, and Alice picture a rough, wandering tongue, like a cat's tongue, because the prose makes the licking sound abrasive. Belinda groans as it continues, and the hosts say they are not surprised if the tongue is as rough as Rocky makes it. The cat comparison is their reading of the description. The Duchess does not say it about herself.