What is sex? Why is sex so important to people?

Sex is life.
It is a basic human drive, a drive, which for the scholar Maslow is a basic human need.
Between two people, especially partners, it is a harmonizer, a generator of intimacy.
In the family, it is the guide to family relationships, influencing the family atmosphere, and harmonious family relationships create emotionally stable children.
In society, it is a stabilizing force that keeps our relationships with others on an even keel.
Thus, sexual reconciliation and stabilization will influence our omnipresent lives all the time.