More than 100 young people committing child sex abuse in Lincolnshire
More than 100 offences of under-18s committing child sexual abuse were reported to Lincolnshire Police in the last three years.
Figures obtained by the NSPCC through the Freedom of Information Act revealed a total of 126 child sex abuse cases.
This is part of the England and Wales combined total of 5,028 during the same time period.
In some cases, older children are attacking younger ones, while in others, it is sexual abuse within a teenager relationship.
There is also an increasing problem of sex crimes on the internet and mobile phones, including online grooming, harassment in chat rooms and 'sexting'.
Some children as young as five or six are even committing acts such as rape and other serious sexual assaults.
Nearly all the offenders, 98 per cent, were boys. And where the relationship was recorded, at least three out of five of the victims knew their abusers.
More than one-third of the offences were said to be committed by a family friend, and one in five times it was a family member.
The findings follow a report by probation inspectors last month which found that police, social workers and teachers were missing the warning signs that a child may sexually offend.
The NSPCC, which provides treatment to help reform children as young as five who exhibit signs of harmful sexual behaviour, is warning that easy access to indecent material could be leading to an increase in the number of children needing help.
Claire Lilley, policy advisor at the NSPCC, said: "We hope our findings will ring alarm bells with the authorities that this is a problem which needs urgent attention.
"In some cases older children are attacking younger ones and in other cases it's sexual violence within a teenage relationship. While more research needs to be done on this problem, we know that technology and easy access to sexual material is warping young people's views of what is 'normal' or acceptable behaviour.
"Children who are sexually abusive have often been victims of abuse, harm and trauma themselves. Exposure to this can make them think abusing someone or being sexually violent is ok.
"But evidence shows that most young people who receive behaviour changing treatment early on, such as that offered by the NSPCC, will not continue to sexually abuse others or grow into adult offenders.
"If we are to tackle this growing problem and protect young victims, more needs to be done to identify and treat children at risk of sexually offending. And we must do more to shield young people from an increasingly sexualised society."
Any adult worried about a child or in need of help and advice can contact the NSPCC's helpline on 0808 800 5000.
Children and young people can contact ChildLine on 0800 1111.