Two in three Australian women have been sexually harassed at work, with the majority of cases unreported, according to a survey released on Tuesday that highlighted challenges activists said prevent women from advancing in their careers.

Some 64 percent of women and 35 percent of men said they had been harassed at their current or former workplace, according to the survey of over 9,600 people by the Australian Council of Trade Unions, the country's main group representing workers.

The majority of those surveyed said they were subjected to offensive behavior or unwanted sexual attention. However only about a quarter of them made formal complaints, due to fears of repercussion, the survey found.