John Mayer is allegedly back to his womanizing ways. According to hollywoodlife.com, Mayer has been sexting Katy Perry’s good friend Rihanna just weeks after he and Katy split. A source says his texts were very sexy, and he said they should get together. Perry and Rihanna have been friends for years. Perhaps Mayer began chasing Rihanna while still involved with Katy. Who knows? But it certainly could’ve caused the breakup.