Lust. Pure lust. It's primal, it's capricious, and it happens every day (relentless?). Before I continue I'd like to say I'm jaded on questions like this, not because of anything bad to me happening personally, but only for the reasons listed below. 1) nature: lust is prevalent in nature, it's the guiding force for "survival of the fittest;" in nature, an animal will always go for the "fittest," the alpha- same thing is true for humans, since we've evolved; hence attraction is shown to be primal, formulaic, and arbitrary. 2) attraction: on a societal level, attraction is our aegis, our metric for "love." However, this is only the formula that becomes the capricious agent of lust. In evolutionary biology, there is a theory called the red queen's hypothesis that says the rate of adaption between predator and prey is constantly changing and thus incurs more change. A similar principle guides attraction. Because it's primal and biological, ppl will constantly look for the "alpha" (or the fertile). This makes it arbitrary and capricious. Studies have been conducted that show biological factors are constant even though different cultures define attraction differently. Moreover, one only needs to look at 50ish % divorce rate in the US to know that these capricious agents are at work. 3) the media and society: both feed the primal urge relentlessly, giving it a voracious appetite. This indomitable force shapes many worldviews and have a symbiotic relationship. The images of the media are over sexualised and spill into society, which creates even more over sexualised images. It creates even more lust. This isn't just us- it was true of the Greeks, Romans, Sumerians, Egyptians etc. And yes, even they all had their "morality" problems (pick up Plutarch and prove me right). As long as there is a media, it will influence society and sexuality.