Relationships at an early age

Today, more and more children have relationships which aren't normal at an early age. The relationships have a purpose, to multiply the species, thing that kids can't do normally.
On one hand, kids get experience for their next serious relationships. Children also soicialise each other. Futhermore, these experiences help them create an open-hearted character.
On the other hand, relationships can chage kids' mind about a normal relation. They can even remain with traumas after a sad experience. Moreover, they loose their interest for school.
All in all, relationships at an early age aren't so good because kids remain with many traumas that can change their life.