Six-year-old boy accused of raping his cousin, aged five, in 'mummy and daddy game' Case in Malaysia believed to be the one of first of its kind in the world Medical check-up found girl had been sexually penetrated after grandmother discovered children naked together Girl's mother reported case but told police she didn't want any action taken against the boy Consultant doctor says boy could have seen pornographic material A Malaysian boy aged six has been accused of raping his five-year-old cousin in a case believed to be the one of the first of its kind in the world. Doctors discovered she had been sexually penetrated after a medical check-up - and despite initial scepticism a consultant urologist at the Kuala Lumpur Hospital said it was possible for a child that young to have an erection. The extraordinary case came to light after the children's grandmother found them naked and playing 'mothers and fathers' at the family home in the town of Pendang, Kedah - a rural area covered with paddy fields Medical check-up: Doctors at Kuala Lumpur discovered the five-year-old girl had been sexually penetrated by the boy in a case which has shocked Malaysia Trauma: The case in Malaysia is believed to be one of the first of its kind in the world. The girl's 32 year old mother, a medical assistant, then lodged a report on New Year's Day, Malaysia's Star newspaper reported. But the paper said that the following day the mother told police she was not keen to pursue the case and had only reported it so her daughter could be checked at a hospital. The doctor who examined the girl and found a minor tear in the hymen alerted the Malacca Action Group for Parents in Education. Chairman Mak Chee Hin said: 'It is shocking that young children are capable of such acts. Rural: The town where the boy is alleged to have raped the girl is surrounded by paddy fields Blame should be levelled at the adults who do not give guidance and care to the children. He added that a full medical report would determine whether the six year old boy is the youngest predator in the country. The case comes just weeks after a boy of 11 allegedly raped a six-year-old girl at a babysitter's home in Alor Gajah. The consultant urologist, who asked not to be named, told The Star that that it was possible for a boy of that age to have an erection, although such occurrences were more common among Caucasian children. Sexual development began from a child's first year, he said, pointing out that some baby boys were even born with erections. It could be due to witnessing an adult performing an intimate act or watching pornographic videos Consultant Urologist at Kuala Lumpur Hospital He added: 'In Western countries, medical reports suggest that young boys and girls can experience orgasm although boys will not be able to ejaculate until puberty. For Asian children, it is very rare, although there have been rare cases that are mostly attributed to surroundings and upbringing. This case, he added, could have happened due to exposure to pornographic materials. It could be due to witnessing an adult performing an intimate act or watching pornographic videos, said the urologist. Even if the child had an erection, it would have only lasted for a while and not to the extent of penetration.