There has been some recent debate about the likelihood of intelligent life existing in other solar systems, with specific reference to the UFO question. As you would expect, ETH believers think that intelligent life is probably very common, whilst ETH sceptics suggest that it may be very rare.Both sides are able to support their cases with the opinions of scientists, for the simple reason that scientists are themselves divided on the issue. 
The main driving force of ufology is the belief that there is something genuinely mysterious going on behind the scenes of UFO reports and UFO lore. What keeps this belief going is a psychological need for mystery for most people, and a psychological need for notoriety, book contracts, lecture tours, etc. for a few people. Well, that's what the Pelican believes and, remember, he enjoys a bird's-eye view of the ufological scene.
The following essay is an attempt to establish the parallel role and content of the abduction narrative and pornography. By this I do not mean that the numerous books, articles and documentaries allegedly reporting the true abduction and sexual abuse of humans by extraterrestrial beings are deliberately written to provoke sexual arousal. Indeed, I sincerely I hope this is not the case.
Marriage in many technologically primitive societies is frequently by abduction. The Amerindians of Tierra de Fuego sought their wives in this way. Although many such cultures now have elaborate rules concerning betrothal and courtship, among the Kagora and Kadara tribes of northern Nigeria, for example, ‘(a)ll secondary marriages begin with wife abduction’. [14] Nor are they isolated examples.