clarification for clarity purposes: it's not face-sitting that is banned, it's "suffocation". it remains to be seen what the courts are going to interpret as "suffocation". my guess is that if trans people are involved, probably hand in mouth, ball gags, and kissing.

"The term ‘suffocation’ is not defined in the legislation and will be given its ordinary meaning. Whether an image depicts suffocation will be a question of fact for the court in each case. We consider that suffocation will generally mean depriving a person of air in a way that affects their ability to breathe. Unlike strangulation, this does not require pressure to the neck. It could, for example, involve covering someone’s mouth and nose or compressing their chest."
https://www.gov.uk/guidance/crime-and-policing-act-2026-offences-relating-to-pornography#what-we-mean-by-strangulation-and-suffocation