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There are five different levels in Maslow's hierarchy of needs:
Physiological needs, security needs, social needs, esteem needs and self-actualizing needs
After physiological and security needs are fulfilled, people will move onto the next level of needs - social needs. Social needs comprise of affection, intimacy, family, relationships, etc. People need to feel a sense of belonging and being accepted by the people around them, be it at work, at home or at play. They need to love and be loved by others. Often, this need for love can be fulfilled both physically (sexually) and emotionally.
Without each other, life doesn't seem worth living. As teens going through what Teens shouldn't have to go through they later realize that its "So Cold" being without one another.