A teenager bit a man who was raping her and the marks she left behind were later matched to her teeth, a jury was told yesterday. The 18-year-old woman said she bit her attacker 'really hard' on each upper arm as he pinned her down on a bed. 'His arms were beside me and I bit him . . . I bit him several times,' she said. Asked by the judge whether the man had reacted when she sank her teeth into him, the witness said: 'He continued pinning me down.' Prosecutor Jackson Poon said the teenager could not prevent herself from being raped by biting the attacker. But when he was arrested four days later, the marks could still be seen on his arms, it was alleged. A dentistry expert examined photographs of the marks and compared them with a model of the woman's teeth. Mr Poon said: 'He concluded that the teeth model of the victim matches the bite mark on the right arm of the accused. It is highly probable the victim made the bite marks on the right arm of the accused.' The marks on the other arm were not clear enough to be compared. Mr Poon said the marks were evidence of 'defensive bites, not love bites'. There was also DNA evidence to show it was extremely likely that the defendant had sex with the woman. Andy Yau Man-dick, a 22-year-old clerk, pleads not guilty to raping the woman on December 28 last year. The witness wept as she told how she was forced to have sex with Yau after meeting him in a Tai Po karaoke bar and going to his home to watch films. She had at first been accompanied by a girlfriend but agreed to stay behind when that woman left. Yau had suddenly switched off the lights and tried to cuddle her, the court heard. When she tried to resist his advances, he pinned her to a bed and raped her, it was alleged. The Court of First Instance trial, before Mr Justice Michael Burrell, continues today.