They will only tell you sunshine and happiness."Ms Mc Lean said parents should maintain an "open conversation" with their children about what games they were playing and downloading.
Ms Mc Lean added that parents should be researching games online and checking in with parenting information on the website of Australia's Children's e Safety Commissioner.
Create a business, buy an island or become a cheerleader - this game is all about living your dreams.
To become a resident, all users have to do is download the software, register a character and start exploring.
It's become a prime space for big brands to target, with Vodafone planning to launch virtual telephones, the record company Sony BMG supplying music, and Adidas creating a virtual 3D version of their new Predator trainers.
The news agency Reuters recently announced that it was opening its first virtual bureau in Second Life.
Just as spoken words only hang in the air long enough for ears to hear them, these images last just long enough to be seen (or more accurately, for 24 hours) and then they disappear.
Australian cyber safety expert Susan Mc Lean told ABC Radio Darwin the news report came as "no surprise".
But Ms Mc Lean said concerns about Roblox highlighted a broader issue."Any app or platform or game that allows two-way interaction between your child and another player is going to have predators on it," she said."And then the risk ramps up when you can have chat.
That's one of the features of this game."I think this is a very important warning for parents to not [just] look at the app or game developer's website.
Parents are being reminded to pre-vet every app their young children download amid renewed concerns that virtual reality gaming is exposing minors to sexual advances.
The US-developed game Roblox received global attention this month after a British father decided to check out what his sons were playing on their mobile device.