RAF serviceman who paid women to sit on babies until they screamed in agony for his sexual kicks faces being sent to prison.Andrew Kerr duped the women into sending him cruel and bizarre videos by claiming he was a documentary filmmaker and a stuntman.Kerr, who made sick jokes about "babysitting" for his fetish videos, bizarrely told a court today that he now plans to find a girlfriend and start a family.Sentence on Kerr was deferred for social workers to study a specialist report on him which