A few quotes about renunciation

"Spiritual life means to gradually forget sex life. Material life means sex life. In the spiritual world there is no sex life because there is no birth, there is no death. That is stated in Bhagavata. Although the women are very, very beautiful, many thousand times more beautiful than here... Their stature of body, their everything, youthfulness, everything. But still they are so much engaged in Kṛṣṇa consciousness, in chanting the glories, that they are not, I mean to say, influenced by the lust. That is stated in Śrīmad-Bhāgavata, in the Vaikuṇṭha. There are women. They also, men and women there is, and they also go by airplane, fly in the sky for trip, and all of them are devotees to Nārāyaṇa, Lakṣmī-Nārāyaṇa associate. So these things are described. So similarly, amongst the gopīs also. So in the spiritual life there is nothing like this sex pleasure. And the more we forget sex life, that means we are advancing in spiritual life."
(Garden Conversation -- June 23, 1976, New Vrindavan)

In Vaikuṇṭha there is no sex life because the sex pleasure is not the foremost pleasure in the Vaikuṇṭhaloka. The sex pleasure is foremost here in this material world. They have got so much transcendental spiritual pleasure, this sex pleasure—they are astonished: is that pleasure? (Makes spitting sound) Phu! Yad-avadhi mama cetaḥ kṛṣṇa-padāravinde nava-nava-rasa-dhāma... That stage is possible. Still there are so many brahmacārīs. So everything depends on practice. Abhyāsa yoga-yuktena [Bg. 8.8]. That requires determination."
(Garden Conversation -- June 23, 1976, New Vrindaban)

"Yet despite the pleasant atmosphere, the minds of the denizens do not become agitated because in the spiritual world, the Vaikuṇṭha planets, the spiritualistic minds of the inhabitants are so much absorbed in the spiritual vibration of chanting the glories of the Lord that such enjoyment could not be surpassed by any other enjoyment, even sex, which is the culmination of all pleasure in the material world. In other words, in the Vaikuṇṭha world, in spite of its better atmosphere and facilities, there is no impetus for sex life. As stated in Bhagavad-gītā (2.59), paraṁ dṛṣṭvā nivartate: the inhabitants are so spiritually enlightened that in the presence of such spirituality, sex life is insignificant."
(Srimad Bhagavatam 4.6.30, Purport)

"According to Bhaktivinoda Ṭhākura also, a husband and wife can turn the home into a place as good as Vaikuṇṭha, even while in this material world. Being absorbed in Kṛṣṇa consciousness, even in this world husband and wife can live in Vaikuṇṭha simply by installing the Deity of the Lord within the home and serving the Deity according to the directions of the śāstras. In this way, they will never feel the sex urge. That is the test of advancement in devotional service. One who is advanced in devotional service is never attracted by sex life, and as soon as one becomes detached from sex life and proportionately attached to the service of the Lord, he actually experiences living in the Vaikuṇṭha planets. In the ultimate issue, there is actually no material world, but when one forgets the service of the Lord and engages himself in the service of his senses, he is said to be living in the material world. "
(Srimad Bhagavatam 4.23.29 Purport)