It is after Nottinghamshire Police officially cautioned two teens for sharing an explicit photo.
The force then wrote a letter to all the schools in the county, warning that other under 18s could face arrest, or even be made to join the sex offences register.
Beth Stout is Chief Executive of the Golddigger Trust, who provide education in schools about sex and relationships.
Speaking on Premier's News Hour, she said some teenagers just don't realise it's illegal:
"It is something that is really rife in youth culture and it's become a bit of a norm.
"So, the way that the police have dealt with it is saying, 'we need to express to young people, and to parents, and to schools, that this is a serious offence'.
"We do a fair bit of work in trying to explain to teenagers what it is that's actually going on and that is it serious, and that requesting an image, even, is an offence."
In the UK it is illegal to create, possess or distribute indecent images of children.
Other organisations, such as the NSPCC, have said they do not think that children should be prosecuted for sexting offences.
Beth Stout explains how easy it is for things to get out of hand when indecent images are shared: