A sick couple have been put behind bars after turning their children into 'sex slaves' because they ran out out of money to pay prostitutes. The father and mother, who are both in their forties, appeared in court in Tongeren, Belgium last month over the rape of the four daughters, who were aged between 12 and 21 at the time of the incidents. The man is the father of one of the children, while the other three are daughters of the mother. The Belgian court heard how the dad had a sexual fixation