There is a great article in The Telegraph by Louise Perry of We Can't Consent to this. It discusses how a defence of consensual sex is being used by killers to escape a murder conviction. It cites the changes to the domestic violence law designed to protect more victims and the impact of ubiquitous violent porn.
We have seen a rise in the proportion of women reporting such violence at exactly the same time that we have seen the mainstreaming of extreme violence in porn. Sexualised images of strangulation are widely available on social media platforms such as Instagram, Pinterest, and Tumblr, which claim to be suitable for children aged 13 and over, and we have heard from many young women that they feel under pressure to go along with ‘rough sex’ including strangulation, for fear of being labelled prudish