Although the person in full Krsna consciousness may apparently be on the sensual plane, because of his being Krsna conscious, he has no attachment to sensual activities. BG 1972 purports

Expressions researched:
"Although the person in full Kṛṣṇa consciousness may apparently be on the sensual plane, because of his being Kṛṣṇa conscious, he has no attachment to sensual activities"

Bhagavad-gita As it is

BG Chapters 1 - 6

Although the person in full Kṛṣṇa consciousness may apparently be on the sensual plane, because of his being Kṛṣṇa conscious, he has no attachment to sensual activities. The Kṛṣṇa conscious person is concerned only with the satisfaction of Kṛṣṇa, and nothing else. Therefore he is transcendental to all attachment.

BG 2.64 (1972), Translation and Purport

One who can control his senses by practicing the regulated principles of freedom can obtain the complete mercy of the Lord and thus become free from all attachment and aversion.

It is already explained that one may externally control the senses by some artificial process, but unless the senses are engaged in the transcendental service of the Lord, there is every chance of a fall. Although the person in full Kṛṣṇa consciousness may apparently be on the sensual plane, because of his being Kṛṣṇa conscious, he has no attachment to sensual activities. The Kṛṣṇa conscious person is concerned only with the satisfaction of Kṛṣṇa, and nothing else. Therefore he is transcendental to all attachment. If Kṛṣṇa wants, the devotee can do anything which is ordinarily undesirable; and if Kṛṣṇa does not want, he shall not do that which he would have ordinarily done for his own satisfaction. Therefore to act or not to act is within his control because he acts only under the direction of Kṛṣṇa. This consciousness is the causeless mercy of the Lord, which the devotee can achieve in spite of his being attached to the sensual platform.