Everyone is busy to see the body. And the body, expansion of the body, is described here. Body, deha, then from the body there are children, apatya. And then, through the wife, body expands, strī. Strī means "Which expands." In this material world the point of attraction is strī and puruṣa, man and woman, male and female. There is an attraction, natural. So the man wants woman, woman wants man, because there is attraction. And when, by that attraction, the man and woman is united, then the result is the children. Puṁsaḥ striyā mithunī-bhāvam etaṁ tayor mitho hṛdaya-granthim āhuḥ (SB 5.5.8). Then the attraction for this material world increases. When one is alone, he's not so much attached with the material world. But as soon as he unites with the other party, then he gets children, and the attraction increases.
The real business is that we have to withdraw our attraction for this material . . . that they do not know. I am a spirit soul. Being attracted by this material nature, I am now encaged within this body, and I am changing this body. Just like I am changing this body from boyhood to childhood, childhood to . . . from childhood to boyhood, from youthhood. In this way, I have been entangled in this transmigration of the soul. This is my problem. Bhagavān, Kṛṣṇa, says: "The real problem is janma-mṛtyu-jarā-vyādhi (BG 13.9)." This is not problem. Nowadays they have discovered so many problems. But actual problem—janma-mṛtyu-jarā-vyādhi—they are not very much serious. Therefore they have been described here as pramattaḥ, mad. He does not know what is the real problem, but he is very busy with the superficial problems. Therefore śāstra says that these people, blind, they do not know what is the problem.