"Beings that live forever have no need for progeny and therefor, no need for sex...."
Immortals are spiritually advanced enough to know how to transform creative energy into spiritual energy, so prefer not to have sex unless they are procreating, because it diminishes the sacred tremor when they release their seed, their life force energy. But for ordinary human beings, who aren't not capable of vibrating in the celestial realms, refraining from sex is simply sexual repression, and that is unhealthy.
When humanity starts teaching the children that they are blessed beings, conceived during sacred holy sexual ritual, instead of having them believe they are the result of a moral downfall, the world will be a much better place, and people will be more likely to take conscious action to develop and refine the eternal aspects of their souls.
Pure spirits, like Christ, do not come here through ordinary human beings. An immortal consciousness is required to contain, tame, educate and maintain the kind of awareness that can nurture embodied celestials to maturity and fruition. Angels don't have sex because they don't have bodies. But the intimate bliss they resonate with continuously will cause an ordinary human being to lose consiousness.
Transformational sex is an opening between the earth plane dimension and the celestial realms. If you have the courage to enter that portal, sex becomes irrelevant. Meditation, Chanting, Drumming, Purification Rituals, Ecstatic Dance, and Accumulation of Spiritual Knowledge, are other ways to take on a light body, and traverse multiple dimensions of reality.
Biblical references that seem to condemn sex, were transmitted by beings dwelling in dimensions where sexual intercourse pales in comparison to the intimate bliss in which they exist. Indulgence for them would simply be a disconcerting distraction.
A harp player consuming the manna of heaven engaged with the celestial game of chess, matter of factly discourages aspiring angels from eating crackers and playing checkers. In doing so, the immortal hopefuls taking dictation, who haven't yet transcended judgementalism, zealously put an interpretive spin on the information and tell everyone that sex is sinful, indulgence a mortal sin. But that interpretation was incorrect. They did the wrong thing for the right reason.
"Until the naturalness of sex is accepted, nobody can love anybody." Osho