The University of Oxford has banned intimate relationships between members of staff and their students.
The institution will introduce the new rule from 17 April after the previous policy of "strongly discouraging" relations was reviewed.
Staff will also be urged not to form any other close personal associations which could be deemed outside "professional conduct".
The policy said those who do not comply will face disciplinary procedures.
In the past, relationships between a staff member and a student were allowed and had to be declared to a line manager.
