At its core, the preventative duty requires employers to take reasonable steps to prevent sexual harassment of their employees. This duty applies from an employee's first day to their last, covering all aspects of their working relationship with the organisation.
Crucially, this is about prevention, not just reaction. You cannot wait for incidents to occur before taking action. The law now requires employers to anticipate potential harassment situations and implement measures to prevent them from happening in the first place.
The duty extends beyond your office walls. It covers employees when they're working in different locations, attending work-related social events, travelling for business, or any time they're acting in the course of their employment.
This broad scope means employers need to think about all situations where their staff might be vulnerable to harassment.