The computer game "No Mercy" centres around a male protagonist who is encouraged to "become every woman's worst nightmare", and "never take no for an answer."
Parliament Technology Secretary Peter Kyle, who is responsible for overseeing the government's online safety strategy, described the game as "deeply worrying" and demanded the tech giant take it down.
The game launched on Steam last month and is described by its own developers as containing violence, incest, blackmail, and what they describe as "unavoidable non-consensual sex."
Mr. Kyle, who is facing pressure over the potential watering down of the Online Safety Act, insisted that Steam should remove the game from its marketplace.
In the UK, physical game releases must carry a PEGI age rating by law. Digital games are not legally required to carry an age rating, but the majority of leading stores use the trusted PEGI age rating process to provide confidence to consumers.
Although games on Steam can optionally apply for a PEGI age rating via our classification process, it is not mandated by the platform prior to a game's release.
The Games Rating Authority has not classified this game and has not been approach to classify it since its release."
Former Secretary of State for Digital, Culture, Media and Sport Nadine Dorries, who championed the Online Safety Bill in its original form, told LBC: "It’s appalling and feeds into the insidious ‘Andrew Tate’ narrative which is taking hold amongst young men who spend too much time on line. I hate banning things, but sadly, social media has taken us to the place whereby for the protection of children, vulnerable adults and women, we have to: this needs to be removed online, immediately."