Fewer sex attacks would happen in the Central Business District (CBD), if people took responsibility for their actions and drank less, according to police.
Police said that sex attacks in a popular nightlife district could be reduced if revellers took care not to drink too much and not wander off with people they have just met.
Some victims of sex crimes in Cairns, in far north Queensland, were so drunk they could not remember what had happened, police said.
"During investigations, it has become apparent that many of the victims have been under the influence of alcohol or other intoxicating substance at the time of the offence and do not recall the act itself or the circumstances surrounding their complaint," The Cairns Post quoted Sen-Constable Cary Coolican, as saying.
"While we respect the individual's right to consume alcohol, we would be encouraging people to make responsible choices regarding who they drink with and the quantity that is consumed," she added.
Coolican said that reports of sexual assaults had increased after police urged victims to report the crimes.
Police have strongly urged revellers to take responsibility for their own safety while partying in the city.
"Avoid mixing drinks and over-indulging. Ensure you designate a driver or have enough money for a taxi and never leave friends with people they have just met," she said.
"Some decisions may result in risky behaviour and unsafe actions," she added.
Paul Garnham, Cairns City Licensee Safety Association president, said that pub and club owners did as much as they could to ensure revellers' safety.
"There is plenty of security and most of the clubs and pubs have reduced promotions to try and help to curb binge drinking and increase safety in the city," Garnham said.
Joanne Leamy, Cairns Sexual Health Service clinical nurse consultant, said that people should always report suspected sexual assault, regardless of the condition they may have been in when it occurred.
"It is important that people continue to report it. Come forward, no matter what. If someone thinks they have been assaulted, they need to report it, talk to Family Planning, get tested for STIs and consider taking the emergency contraceptive pill," she said.
Leamy added that people should consider nominating a responsible friend as their "minder".
"Make sure there is always one in the group that is sober and have money in your pocket for a taxi," she said.
Police has urged victims of sexual assault to continue reporting the crimes.