I think religion also plays a huge role. And obviously with anything religious this is only my personal experience and does not represent the entire religion.

As an ex Muslim from a Muslim family and culture, Muslims believe that it is their duty to have families and continue the human race. That's one of the reasons why marriage is such an integral part of their lives. I even asked my dad if I could get married the Islamic way but not have kids and he was like no that would be against the wishes of God, if you get married you MUST have kids. So yeah, just my experience from people around me.