Love initially comes from appearance and voice at the first sight. A man is attracted to a woman and a woman is attracted to a man by nature. If the world only consists of one woman and one man, they must fall in love as soon as they meet each other. No choice means no competition and simplicity. In the actual world where thousands and millions of men and women come together, a man looks for the most attractive woman whom he can find and a woman looks for the most attractive man whom she can find.

Love only depending on appearance and voice can not last for long, just as attractive appearance and voice can not last for long. The longevity of love depends on good communication, mutual respect, consideration, appreciation, sharing, compromise in disagreement and many other internal spiritual factors.