The report on how parents control their children's access to adult media, revealed that a quarter of children were allowed to play games classified above their age, and 40 percent were allowed to watch films above their age limit, the Guardian reported.
The online survey by ParentPort took into consideration 1,800 respondents from the UK's two largest online parenting communities, Mumsnet and Netmums.
ParentPort said it divulged the "challenges and pressures parents face when it comes to keeping the media their children see age-appropriate".
Over four-fifths, i.e 82 percent of parents said that they closely supervised what films and television programmes their children watch, and 77 percent said that they always or usually know what websites their children visit.
But parents were also apprehensive about their children being given smartphones and laptops as gifts as it would give them unsupervised access to the Internet, and inappropriate 18-rated video games.