Srimad Bhagavatam Canto 07, Chapter 14, Text 13

SB 7.14.13

krmi-vid-bhasma-nisthantam
 kvedam tuccham kalevaram
kva tadiya-ratir bharya
 kvayam atma nabhas-chadih
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Through proper deliberation, one should give up attraction to his wife’s body because that body will ultimately be transformed into small insects, stool or ashes. What is the value of this insignificant body? How much greater is the Supreme Being, who is all-pervading like the sky?
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Here also, the same point is stressed: one should give up attachment for his wife — or, in other words, for sex life. If one is intelligent, he can think of his wife’s body as nothing but a lump of matter that will ultimately be transformed into small insects, stool or ashes. In different societies there are different ways of dealing with the human body at the time of the funeral ceremony. In some societies the body is given to the vultures to be eaten, and therefore the body ultimately turns to vulture stool. Sometimes the body is merely abandoned, and in that case the body is consumed by small insects. In some societies the body is immediately burned after death, and thus it becomes ashes. In any case, if one intelligently considers the constitution of the body and the soul beyond it, what is the value of the body? Antavanta ime deha nityasyoktah saririnah: the body may perish at any moment, but the soul is eternal. If one gives up attachment for the body and increases his attachment for the spirit soul, his life is successful. It is merely a matter of deliberation.
Srimad Bhagavatam Canto 07, Chapter 14, Text 12
Srimad Bhagavatam Canto 07, Chapter 14, Text 14