A priest who served at two Wollongong parishes has denied allegations he sexually assaulted a 20-year-old international university student six years ago.Warning: This story contains descriptions of alleged sexual assault that some readers may find distressing.Martin Joseph Van Sang Mai, 55, faced the Wollongong District Court, where he pleaded not guilty to sexual intercourse without consent relating to an incident in 2019. Crown prosecutor Mark Rollestone aired the allegations against Mr Mai in an opening address on Monday.The court heard one night in August 2019, Mr Mai allegedly entered a bedroom where the complainant was sleeping.The complainant had moved from Vietnam to Australia to study at university.It is alleged Mr Mai put his hand in the complainant's pants, leaving the student feeling scared and confused, Mr Rollestone said.The priest then allegedly orally raped the man and masturbated before he left the room.Mr Mai was charged in 2022 after the complainant reported the alleged incident to the police.Mr Rollestone told the court Mr Mai had a tendency to act on his sexual interest in young Vietnamese males.Defence barrister Matt Davis said the oral sex with the complainant never happened and urged the jury members to keep an open mind when hearing the evidence throughout the trial. "Cases aren't decided on emotion, cases aren't decided on pre-judgement," he said. The trial before Judge William Fitzsimmons is expected to run for six days.