 In discrimination law, O'Regan co-authored "Prinsloo v Van der Linde", which established the connection between the right to equality and dignity, and penned a unanimous judgment in the 2003 follow-up to "Satchwell v President of the Republic of South Africa".Better known are her two dissents.In "Minister of Home Affairs v Fourie", she strongly criticised the majority for referring the regulation of same-sex marriage to Parliament rather than providing immediate relief.