Peter Wanless, chief executive of the NSPCC, said: "Sharing nude selfies can put young people at risk of bullying by peers or being targeted by adult sex offenders, so it's vital that parents talk to their children and that young people feel empowered to say no to sexting requests.
"We realise that talking about sexting can be an embarrassing or awkward conversation for both parents and children.
"And although most parents said they would seek help if an indecent image of their child had been shared on the internet, half of them weren't confident about getting the right support.
"The NSPCC has created a new guide for parents to help them talk to their children about the risks of sexting, what the law says, and what to do if their child has shared a nude image that is being circulated online or among their peers."