Karma. At least, I believe in it.
Perfect example. Saw this 8.5 (SMOKIN', and it wasn't slutty suck me look, it was the normal innocent girl look, which I find ****in hot) with her total AFC boyfriend at the movies (I was there with my friend and his friend) watchin EuroTrip (Great movie BTW). Anyways, so she's eyeing me through the whole movie (I was sitting towards the arm rest and I have extremely pimp peripheral vision). I turned around at the beggining, and the end of the movie, and she was smiling at me. I felt REALLY sorry for her boyfriend, so I didn't want to pull anything.
Let's put it this way. How would you feel if you were in that situation? Some guy strolls along and sees your girl (which is bound to happen considering your 1 out of 6 billion on this earth), and decides 'Hey, I think I'm better then this chump', and steals her from you. Great bud, you just got jipped cause some ******* decided to ruin your relationship. Sure, your girls also to blame even more then he is, but still, just put yourself in that pair of shoes. Doesn't feel so good now does it? Although, you can always stop this by increasing your DJ skills till your equivilent to Casanova, as well as choosing the right girl to date.
So what if societys made it so that girls choose who they want to date? Flip the table and claim it your side!