Devotional service following in the footsteps of the gopīs of Vṛndāvana or the queens at Dvārakā is called devotional service in conjugal love. This devotional service in conjugal love can be divided into two categories. One is indirect conjugal love, the other direct. In both of these categories, one has to follow the particular gopī who is engaged in such service in Goloka Vṛndāvana. To be directly attached to the Supreme Personality of Godhead in conjugal love is technically called keli. This keli performance means to directly join with the Supreme Personality of Godhead. There are other devotees who do not wish direct contact with the Supreme Person, but who relish the conjugal love affairs of the Lord with the gopīs. Such devotees enjoy simply by hearing of the activities of the Lord with the gopīs.
This development of conjugal love can be possible only with those who are already engaged in following the regulative principles of devotional service, specifically in the worship of Rādhā and Kṛṣṇa in the temple. Such devotees gradually develop a spontaneous love for the Deity, and by hearing of the Lord's exchange of loving affairs with the gopīs, they gradually become attracted to these pastimes. After this spontaneous attraction becomes highly developed, the devotee is placed in either of the above-mentioned categories.
This development of conjugal love for Kṛṣṇa is not manifested in women only. The material body has nothing to do with spiritual loving affairs. A woman may develop an attitude for becoming a friend of Kṛṣṇa, and, similarly, a man may develop the feature of becoming a gopī in Vṛndāvana. How a devotee in the form of a man can desire to become a gopī is stated in the Padma Purāṇa as follows: In days gone by there were many sages in Daṇḍakāraṇya. Daṇḍakāraṇya is the name of the forest where Lord Rāmacandra lived after being banished by His father for fourteen years. At that time there were many advanced sages who were captivated by the beauty of Lord Rāmacandra and who desired to become women in order to embrace the Lord. Later on, these sages appeared in Gokula Vṛndāvana when Kṛṣṇa advented Himself there, and they were born as gopīs, or girl friends of Kṛṣṇa. In this way they attained the perfection of spiritual life.