Before Paris Hilton and Kim Kardashian, there was — Johnny Carson? Mashable sat down with Jason Segel, Cameron Diaz and Ellie Kemper from the upcoming comedy Sex Tape and quizzed them on the hush-hush tapes their fellow celebs don't want them to see and there may or may not be mention of a presidential threesome in the interview. Sex Tape opens in theaters on July 18.