The law is aimed at protecting kids from adults.
But the way it's been written says it would also be illegal for people under-16 to kiss and cuddle in public.
It would even apply to boyfriends and girlfriends!
Snog
Some kids' campaigners are upset about this because they think kissing and cuddling is a normal part of growing up.
But the government is telling kids who are happy to have a smooch with each other that they won't get in trouble.
It says it's very unlikely you'll get arrested for having a snog.