While John and Katy were still together, Mayer clicked with General Hospital star Kelly Monaco. According to a source, “[John and Kelly] hooked up immediately. She was open to the things that John’s into, like sexy toys, tying each other up and threesomes. He couldn’t get enough. Kelly was still on his mind. He would text her and try and get her to meet him either at his place in L.A. or a hotel out in the Valley.”
And there's not much to deny, because apparently Katy found the text messages between John and Kelly!