Hugh Hefner’s widow says he was an “odd and robotic” lover who was worse in bed than teenage boys. The Playboy founder, who died age 91 in 2017 from sepsis, is being accused of being terrible in bed by former Playmate Crystal Hefner, 37, who has just published her memoir and was 21 when she started a relationship with the publishing magnate. Opening up in the book about how the pornographer wasn’t “savvy” when it came to sex and branding him “odd and robotic” in bed, she says: “(It was) like Hef was just going through the motions of something that had once been fun and sexy. Or maybe it was ne…