It is a great example, but one cannot beat the metaphor to death. There are also artistic conventions which develop and self-reinforce (re Manga / Anime) as well as marketing forces - re Why do all female superheroes have giant breasts?
The strength of the metaphor is not that a rational analysis of alien / monster motivations leads the average fan-boy to conclude aliens intend to copulate with abducted females, but the unconscious projection of the fan-boy onto the alien / monster, and of course who would you grab then?
An interesting perspective on the validity of emotional states vis-à-vis Rationality.
I have something of a fear of heights. This fear is, I realize, irrational. Certainly, Being afraid of falling and the resultant injury or death is reasonable and potentially useful. However, fear when it is completely unfounded…
I remember a spring break some years back, where I learned to ski and enjoyed it very much indeed. I was, however, held back by my visceral reaction, whenever approaching a portion of the trail where I could not see my path of travel, part of my brain was absolutely convinced that I would find myself plunging into the yawning crevice which awaited me. This was irrational as I well knew that were the designers of ski resorts prone to leaving yawning crevasses laying about they would find a definite limitation in their repeat business.
“Nothing doing,” said my brain, “there is the veritable Grand Canyon just beyond that hillock, and I am locking the legs in ‘Snow Plow’ position until I see different!”