This is caused by the awakening of his Kṛṣṇa consciousness.
In this connection there is the following statement: "How can a person take pleasure in the enjoyment of sex life in this body, which is a bag of skin and bones, filled with blood and covered by skin and flesh, and which produces mucus and evil smells?" This perception is possible only for one who is awakened to Kṛṣṇa consciousness and who has become fully cognizant of the abominable nature of this material body.
A fortunate child in the womb of his mother prayed to Kṛṣṇa as follows: "O enemy of Kaṁsa, I am suffering so much because of this material body. Now I am trapped within a mess of blood, urine and liquid stool, within the womb of my mother. Because I am living in such a condition, I am suffering great pangs. Therefore, O divine ocean of mercy, please be kind to me. I have no ability to engage in Your loving devotional service, but please save me!"