Because Governments are in general, complacent about child protection. And that doesn't necessarily mean exclusively penalties for offenders (by which time the damage is done), but also having social safety nets so that kids, the most vulnerable in those societies, don't even enter into potentially harmful sexualised situations.
Then you have governments that go (too far) to the opposite extreme, such as is taking place in my home part of the UK at present, where a 19 year old has been found picking up girls on Facebook. (When I was at school, a number of the girls had late-teen boyfriends). However, now its cause for hysteria, and panicked letters around every local school.