Because in this material world, the enjoyment, the highest enjoyment one can perceive, that is sex. Therefore in the material world those who are materialists, they are trying to exact happiness simply by that sex life. You'll find so many pictures, naked pictures, this picture, that picture. Why? Because they have no other information of happiness. That is the happiness. They have no other information. In many places this sex enjoyment is duplicated. In another place it is stated, yan-maithunādi-gṛhamedhi-sukhaṁ hi tuccham (SB 7.9.45). The gṛhamedhi, the so-called family men, they are working hard and so hard. Why? Because they have got that point of happiness, sex happiness. That's all. Another poet, he's singing, a Vaiṣṇava poet,
- śīta ātapa bāta bariṣaṇa
- ei dina jāminī jāgi re
- biphale sevinu kṛpaṇa durajana
- capala sukha labha lāgi' re
Śīta ātapa bāta bariṣaṇa. Now, those who are working, oh, they have no consideration that there is snowfall or there is scorching heat. Śīta ātapa, bāta, severe cold, and bariṣaṇa means heavy torrents of rain. Oh, he has to go to the office and work. Śīta ātapa, bāta bariṣaṇa, ei dina jāminī jāgi' re. Night duty. These are severe type of laboring. And the poet says, śīta ātapa, bāta bariṣaṇa, ei dina jāminī jāgi re. Why? Now, biphale sevinu, kṛpaṇa durajana, capala sukha labha lāgi' re. For that momentary happiness I am working so hard.