In October 2014, we launched Flaw in the Law, a campaign to call for a clear new offence that would make it always illegal for an adult to send a child a sexual message.
When we launched the campaign, over 80% of people said this should be illegal, while 3 out of 4 adults thought it already was (YouGov, October 2014).
Over 50,000 of you signed a petition and wrote to the Minister for Online Child Protection calling for a new law.
And thanks to this, the Government listened.
At a major global summit in December 2014 about online safety, the Prime Minister announced that the UK would introduce such a law.
The law was passed as part of the Serious Crime Act (2015). It's now a criminal offence for an adult to send a sexual message to a child.
However, because the law wasn't given a start date, police couldn't charge people with the offence in England and Wales.
Together, we asked Liz Truss to start the law and she finally listened.
Has your child received a sexual message from an adult?
Your child is likely to feel distressed, upset or confused if they've received a sexual message. They might even feel guilty and that it's their fault.
It's a criminal offence for an adult to send a sexual message to a child, so there are lots of things you can do.
By telling you, they might have prevented the situation from becoming more serious. Talk to them about what happened. Did they receive the message from a 'friend' or someone they thought was their age?
Call the police to report it, or call the NSPCC helpline for more advice.
Check privacy settings
And make sure they know how to report abuse.
Let them know they can call Childline at any time if they want to talk to someone about what they've seen.
Figures from YouGov. Total sample size was 2,001 adults. Fieldwork was undertaken between 2nd - 4th October 2014. The survey was carried out online. The figures have been weighted and are representative of all adults in England, Wales and NI (aged 18+).