A teenage girl cannot have had sex with her foster father because she did not see an obvious mark from an operation, a jury has been told.
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The ACT Supreme Court trial of the 35-year-old, who cannot be named, is drawing to a close, and both the Crown and the man's barrister gave their closing arguments to the jury on Thursday.
The carer stands accused of 12 counts of sexual intercourse with the girl when she was aged 14 and 15, in late 2010 and 2011.
The girl claims the pair had sex regularly, almost every day at one point, and that he used emotional blackmail to try to prevent her telling anyone.
But the foster father has maintained his innocence.
He told police in an interview that he had erectile dysfunction, meaning the allegations were not possible.
But his wife gave evidence on Thursday that the pair had been having sex in 2010 and 2011.
Crown prosecutor Anthony Williamson used that evidence to accuse the foster father of deliberately lying to police.
The man agreed he should have elaborated more about his medical problem in the police interview.
In his closing submission to the jury, the carer's barrister James Sabharwal said ''there is a lot of smoke in this case'', but not enough evidence to find the man guilty beyond reasonable doubt.
He said the girl's claims she had sex with the man for one to two hours did not fit with evidence of the man's erectile dysfunction.
Mr Sabharwal said the fact that the teenage girl had told police she didn't remember seeing any obvious marks on his body was telling.
The foster father had a mark from an operation in his groin area.
''If she hasn't seen a mark, she hasn't seen this man naked,'' Mr Sabharwal said.
''And if she hasn't seen this man naked, she hasn't had sex with him.''
But Mr Williamson used his closing submission to the jury to point to the strength of the girl's evidence.
He said it was clear from the level of detail, the way she gave evidence, and from the early complaints she had made to friends, that she was not inventing the story.
The trial continues on Friday, when Justice Richard Refshauge is expected to finish his summing up of the case to the jury.