You can't compare Norway with Pakistan. In western countries, there are plenty of opportunities for young people to experience the life with different partners. In a country where Islam is a dominent religion, people have to wait for their marriage.. Some frustrated ones indulge in immoral activities and then for them, everything becomes legal. In simple terms, they don't care.
Due to financial condition of Pakistan and social requirements, the average age of getting married in increasing in Pakistan. People are not able to afford marriages which have been made easy by the religion.
If there's an opportunity given to children in their school/ college days to indulge in acts that are common in west, this problem will surely decrease..
So in other words, if you fill Norway with a lot of people, bring down their income to a thrid world country level, and then restrict intersex mingling and marrying (either directly or indirectly), I will see how Norway can save itself from this problem too.
As
@ps3linux mentioned earlier.. there is a bond broken between parents and their children.. This could be due to financial pressures where the head of the family is always on a lookout for food for his family and when he returns back extremely tired, he doesn't give even 10 mins to his children. These children go out, make friends and discuss things with an age group that's not suitable for them. Then they take next steps, and then they reach a place from where the return is almost impossible. School education also doesn't focus on morality, religious teachers only teach Quran in Arabic.. On top of that, the teens then make friends of a different age group (because they are curious).. then they want to experience things told by the higher age group.. but they don't find opportunity because we are conservative society.. Then they want to marry early.. but the whole family starts coming after him (rightly or wrongly) that he has no income to support himself, let alone a whole family.. the curiosity doesn't die.. some of such children then involve themselves in some acts.. then they never stop at that..
When I was young, I used to spend a lot of time with my parents and grandparents.. I had monthly subscription of different children magazines.. A lot has changed after that.
Entire society is culprit of the condition we are in..