Nearly every male has been pushed to ask this question at least once in their lives, I'll admit I have too (more than I'd like to think). "Is it because he's more muscular?" "The girl's probably shallow" "I can do better". However, it still baffles me how often men confuse shining qualities with douchebaggery. I'm here to tell you the answer to the very same question you, my fellow males, have been pondering about, just as I have for many years. Be warned, I'm not known for sugarcoating. So, why him?
Let's cut to the chase. Confidence is one of the most attractive qualities in a person. It doesn't matter whether you're a male or a female, confidence will always make you look twice. Confidence in one self, in your abilities, in the way you carry yourself and speak, that is fundamental towards the goal of getting into a person's heart.
2. Being Clear About What You Want (in an appropriate manner)
Many a time, us men tend to beat around the bush. Either that, or we're too impulsive at first. This ranges from shying away from flirtatious comments to stroking her thigh (not cool). Women are humans themselves, and have their own likes and dislikes (not to mention boundaries). Being confident (I can't stress this enough) about what you want, and sticking steadfast to your goals, all the while making it crystal clear to the female you're pursuing about what your intentions are, tends to make women feel you're worth their time. No one likes a bore.
3. Treat Her Right
This goes without saying. Every person wants to be respected. No one likes being treated like trash. If you have any shred of self-respect, you want to be treated in a civil way. No exceptions.
Too often I've seen men bending over backwards to please the woman they like, and ending up becoming a laughing stock and thinking what went wrong. The fact that you were willing to put your self-respect and dignity on the line for a chance to sleep with your crush is what went wrong. Don't be shy to disagree or express yourself when you feel like someone's stepping your bounds. However, remember to do so in a classy manner, and not to go ape-sh**.
Of course, this is not an exhaustive list. There are many more characteristics that don't fit in well when you're trying to pursue someone. And it almost never equates to you being a "nice guy". I'm not here to vouch for anyone, I'm only here to set the record straight, and make the lives of both men and women easier. Good luck!