Bhagavad Gita Chapter 05, Text 21

Bg 5.21

bahya-sparsesv asaktatma
vindaty atmani yat sukham
sa brahma-yoga-yuktatma
sukham aksayam asnute

Word for word: 
bahya-sparsesu — in external sense pleasure; asakta-atma — one who is not attached; vindati — enjoys; atmani — in the self; yat — that which; sukham — happiness; sah — he; brahma-yoga — by concentration in Brahman; yukta-atma — self-connected; sukham — happiness; aksayam — unlimited; asnute — enjoys.

Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Such a liberated person is not attracted to material sense pleasure but is always in trance, enjoying the pleasure within. In this way the self-realized person enjoys unlimited happiness, for he concentrates on the Supreme.

Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Sri Yamunacarya, a great devotee in Krishna consciousness, said:

yad-avadhi mama cetah Krishna-padaravinde
nava-nava-rasa-dhamany udyatam rantum asit
tad-avadhi bata nari-sangame smaryamane
bhavati mukha-vikarah susthu nisthivanam ca

“Since I have been engaged in the transcendental loving service of Krishna, realizing ever-new pleasure in Him, whenever I think of sex pleasure I spit at the thought, and my lips curl with distaste.” A person in brahma-yoga, or Krishna consciousness, is so absorbed in the loving service of the Lord that he loses his taste for material sense pleasure altogether. The highest pleasure in terms of matter is sex pleasure. The whole world is moving under its spell, and a materialist cannot work at all without this motivation. But a person engaged in Krishna consciousness can work with greater vigor without sex pleasure, which he avoids. That is the test in spiritual realization. Spiritual realization and sex pleasure go ill together. A Krishna conscious person is not attracted to any kind of sense pleasure, due to his being a liberated soul.