The organisation told the Sunday Telegraph that 16 and 17 year olds are legally banned from having sex with teachers, youth justice staff social workers to prevent abusing a "position of trust".
It suggested that it's unacceptable that church youth workers, sports coaches and army cadet leaders are not covered by the same legislation. The NPCC said they should be all held to the same standard.
The charity is concerned that the law is allowing paedophiles to groom children at an early age before starting to sexually abuse them when they turn 16.
This call for a change in law comes after recent reports from The Daily Telegraph that found the Catholic Church and the Government tried to use claims that child sex abuse victims consented in order to repel compensation cases.
In July a coalition of charities said freedom of information requests revealed The Criminal Injuries Compensation Authority (CICA) refused payments to almost 700 child victims, even if their predators were jailed.
In response the findings, a CICA spokesperson said: "Our guidelines are intended to make sure that controlling and abusive behaviour is taken into account when handling compensation applications.
"We are urgently reviewing our guidelines to ensure they are robust enough to deal with cases where grooming may be a factor."
Alumudena Lara, head of policy for the NSPCC told the Sunday Telegraph that the NSPCC has learned of several cases where a teenager in a sport or youth work setting has been groomed as a child and an adult would "take advantage of them as soon as they turn 16".
She said: "Safeguarding in children's clubs should not suddenly end at 16."
