SHE was once voted the ­sexiest woman in the world, but Gillian Anderson feared she would look “creepy” playing the on-screen lover of a woman half her age. The X-Files actress, 58, is cast as reclusive ex-horror movie star Billy Presley in erotic slasher Teenage Sex And Death At Camp Miasma, opposite 31-year-old ­Hannah Einbinder....