There is no sexual relationship in the spiritual world.

In the material world, opulence is achieved by materialistic persons by dint of their labour. One cannot enjoy material prosperity unless he works very hard to achieve it. But the devotees of the Lord who are residents of Vaikuntha have the opportunity to enjoy a transcendental situation of jewels and emeralds. Ornaments made of gold bedecked with jewels are achieved not by working hard but by the benediction of the Lord. In other words, devotees in the Vaikuntha world, or even in this material world, cannot be poverty-stricken, as is sometimes supposed. They have ample opulence for enjoyment, but they need not labour to achieve them. It is also stated that in the Vaikuntha world the consorts of the residents are many, many times more beautiful than we can find in this material world, even in the higher planets. It is specifically mentioned here that a woman’s large hips are very attractive and they stimulate man’s passion, but the wonderful feature of Vaikuntha is that although the women have large hips and beautiful faces and are decorated with ornaments of emeralds and jewels, the men are so absorbed in Krishna consciousness that the beautiful bodies of the women cannot attract them. In other words, there is an enjoyment of the association of the opposite sex, but there is no sexual relationship. The residents of Vaikuntha have a better standard of pleasure, so there is no need for sexual pleasure.

Source: A.C. Bhaktivedanta Swami Prabhupada (2014 edition), “Srimad Bhagavatam”, Third Canto, Chapter 15 – Text 20