The Crown had suggested Swann was "making it up as he went along", Justice Moore said.
However, if the jury was satisfied he had lied they must consider other reasons people might lie in a stressful situation such as a criminal trial, he said.
The judge summarised the case for the jury this morning giving direction on how to approach a verdict.
Justice Simon Moore pictured at another case earlier this year. Photo / Dean Purcell
He repeated that the reason this was a retrial was "utterly irrelevant" and that retrials were not uncommon.
"Your task is to focus solely on the evidence you hear in this trial."
Justice Moore cautioned the jury against being influenced by prejudice or sympathy.
While it was natural to "feel strongly about offending against young people" it could not be said that because someone is charged with offending that they were guilty.
"As judges you must be fair and objective. You are a judge of the facts."