Hill, who is an associate professor of social sciences at the University of Sydney, has been studying menstrual leave as an employment policy for about three years, after stumbling across it while researching gender equality in Southeast Asia. Her research found parallels in arguments for and against menstrual leave as those used to debate parental leave in New Zealand and Australia before its implementation. Critics' key concern about menstrual leave, says Hill, is that it may discriminate against people who have periods, reinforcing stereotypes and stigmas attached to menstruation. But its supporters argue menstrual leave is a policy part of a broader movement towards having inclusive workplaces.