Closing submissions have been given in the ACT Supreme Court, where the Sydney teacher is facing charges that he sexually assaulted the dance pupil in a hotel room during a competition in Canberra last year.

The man, who cannot be named, is fighting the charges, saying the sexual encounter in the early hours of the morning was consensual.

The instructor had offered his pupil a room to stay on the last night of the weekend trip to Canberra, after the teenager's accommodation plans fell through. He went out to an after-party and came home affected by alcohol, at which point he has been accused of touching and performing oral sex on the student, whom he invited into his bed.

The Crown prosecutor told the court on Monday it was obvious the victim had been nervous when recounting the incident, during which he ''froze'' while the accused repeated ''it's OK, it's OK''.

The Crown also referred to transcripts of text messages between the victim and a friend, where the former wrote, ''I have so much to tell you and none of it's good''.

''He said that he was disgusted, horrified and scared,'' she said.

''This is not the language of someone who had a consensual sexual encounter.''

The Crown described the accused as a ''calculated and rehearsed witness'' who had been in a position of authority during the incident. She said the victim had described the dance teacher as being ''like a father figure'' who he had received lessons and training from on a regular basis.

''He was a 17-year-old boy in a town he was not familiar with, with no car and nowhere else to stay that night,'' she said.

''In those circumstances, there could be no consent.''

The defence counsel, however, described the incident as a ''consensual though awkward'' encounter.

He said the victim wasn't an accurate witness, saying some other parts of his evidence had been demonstrated as ''growing and growing'' while the accused had been consistent.

''The truth never changes,'' he said.

''The accused was unshaken in his evidence. He remained consistent.'' He said the text messages sent from the victim did not imply that he had been assaulted by the accused, who he said gave a ''frank and soul-searching'' police interview following the incident.

He also said it was hardly credible to equate the appointment of a new dance partner for the victim with hush money.

He urged the jury to approach the evidence with an ''open and impartial'' mind and put aside any disapproval they may feel about the same-sex nature of the incident or the 26-year age gap between the two.

''You can be downright disgusted and still acquit,'' he said.

''This is not a court of morals, this is a court of law.''

Justice Hilary Penfold summed up the case for jury members, due to return to the court on Tuesday, when they are expected to retire.