A shocked passenger claimed a woman was 'performing a sex act' on a man near him on the top deck of a moving London bus.
Mobile phone footage shot by a member of the public shows a couple sat next to each other as the bus travels through Hounslow, west London, according to a social media post.
The woman appears to be slumped over the man, with her head in his lap.
Neither of them say anything, but the man seems to look down in her direction.
The poster claims that the woman is performing a sex act on the man in the footage which has been shared online.