The singers both need frequent vocal rest, especially Mayer, who recently suffered serious vocal-cord problems, People magazine reported Friday.
"I understood that he couldn't talk, and the only way he could communicate was through an iPad," Perry said during an appearance on "The Ellen DeGeneres Show." "Some days I have to go on complete vocal rest, like no anything, no whispering. Whispering is actually really bad. There's just a lot of silence in our house most of the time."
DeGeneres suggested the two begin playing Pictionary.
"We should just learn sign language," Perry said.