Mother: Your brother already did THAT! Now it is your turn.
Son: No! I DO NOT!
Mother: You won't be able to get married with someone in the future.
Son: It is fine! I will marry with Japanese girl.
I laughed when Japanese mother told me this story because a boy knew Japanese in general not practicing it and he used this fact to escape from pain. That is clever.
Language certainly explains how important it is.