Online marketplace Vinted says it has removed sexually explicit adverts, after a mum reported seeing a video depicting what she believed to be a pornographic scene while browsing for clothes.
Kirsty Hopley, 44, from Carlisle, said she was searching the app for a dressing gown when the ad popped up.
She was sitting next to her teenage daughter at the time.
Ms Hopley reported the content to Vinted and later contacted Ofcom.