An academic awarded a doctorate by Glasgow University for his thesis which described sex between adults and children as sometimes positive was criticised last night by child abuse experts. Richard Yuill said his research, based on interviews with paedophiles and their victims, "challenged the assumption" that sexual relations between adults and under-16s were inherently abusive. "The conclusions are that in such relationships I think you've got the good, the bad and the ugly, and that's where I stand on that," he said in the Times Higher Education Supplement. But child abuse experts said his thesis would play into the hands...