First, the High Sparrow says to the Queen of the Seven Kingdoms, "The king mentioned that, since your reunion, you haven't joined him in the marriage bed. You have a duty, Your Grace. To your husband, your king, the country, to the gods themselves." And then when Margaery effectively says that Tommen is yucky, he says, "Congress does not require desire on the woman's part. Only patience."
It will be good to see him die.
Now that Olenna is departing and Jaime is booted from King's Landing, too, and her own family and any former allies have all turned their backs on her, Cersei is, as Olenna strongly suggested, "surrounded by enemies, thousands of them." The smoldering look on Cersei's face when Olenna says, "You've lost" would be priceless if I thought that was the least bit true.