Online pornography showing strangulation or suffocation is to be made illegal, as part of government plans to tackle violence against women and girls.
It follows a review which found depictions of choking were "rife" on mainstream porn sites and had helped normalise the act among young people.
Both the possession and publication of such material will be a criminal offence, under amendments to the Crime and Policing Bill currently going through Parliament.
Online platforms would also be required to proactively detect and remove such material or face enforcement action via media regulator Ofcom.