Religious leaders and sports coaches could be banned from having sex with 16 and 17-year-olds in their care under plans to expand child abuse laws.
The move would close a legal loophole under so-called position of trust laws, which already apply to teachers and doctors among other professions, and would make sexual relationships between people in these positions and those they supervise illegal.
The Government’s pledge follows prolonged calls from campaigners amid concerns predators in such roles could exploit the influence they have on young people, leaving them vulnerable to abuse.
Peter Wanless, chief executive of the NSPCC, said: “We are delighted that after relentless campaigning, the Government has finally listened to our calls and agreed to close this legal loophole.
“This landmark step sends a clear message that children and young people can return to the extracurricular activities they love without being at risk of grooming by the very adults they should look to for support and guidance.”
It is one of a raft of measures proposed by the Government in its Police, Crime, Sentencing and Courts Bill which is due to be introduced to Parliament on Tuesday as part of efforts to overhaul the justice system.
The wide-ranging plans will also look to bring in Whole Life Orders for child killers and allow judges to hand this punishment out to those aged 18 to 20 in exceptional cases, such as for acts of terrorism causing mass loss of life.
Life sentences could also be imposed on killer drivers, and automatic release halfway through jail terms could be ended for serious violent and sexual offenders.
It also plans to increase the maximum penalty for criminal damage of a memorial from three months to 10 years, give police more powers to tackle non-violent protests which cause significant disruption, and crack down on unauthorised encampments.
The proposals seek to place a legal duty on councils, police, criminal justice bodies, health and fire services to tackle serious violence and share intelligence.
As part of the Bill, deaf people could sit on juries for the first time, with sign-language interpreters allowed into jury deliberation rooms.
Justice Secretary Robert Buckland said the Bill was giving the “police and courts the powers they need to keep our streets safe, while providing greater opportunities for offenders to turn their lives around and better contribute to society”.
Home Secretary Priti Patel said it would help “stop violent criminals in their tracks, putting the thugs who assault officers behind bars for longer and strengthening the support officers and their families receive”.
But some campaigners hit out at the plans.
Human rights group Liberty branded measures to crack down on protests an “assault on our rights”, adding: “They risk stifling dissent and making it harder for us to hold the powerful to account.”
On plans for longer sentences, Peter Dawson, director of the Prison Reform Trust, said: “There is not a shred of evidence to show that this runaway inflation in punishment reduces crime.”
Kate Paradine, chief executive of Women in Prison, described jails as a “dead end” that will not solve the underlying problems of offending or make communities safer.