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A guy can be bright, buff, beautifully handsome, funny and extremely nice and sensitive, but, often this is still not good enough...if she's in some kind of independent phase in her life, and you are nice to her, she may give you the brush off, because she's looking for a brief hookup with an asshole. This is why some guys suspend the Mister Nice-guy persona, and just play the numbers game, meet as many women as they can, and a certain per centage will fall their way. It may be cold and ruthless but it works, and there's less hurt involved.
A mature person realizes this works both ways, and that any relationship is a gamble.
Both men and women can desire brief hookups, and I do believe they have their place. It's rough on anyone if you fall for someone who doesn't have the same set of feelings to return, but this is no reason to indefinitely suspend your sincerity for every possibility. If you think you want to pursue a relationship with a person, just take it slow and cautiously in the beginning.
By the same token, I have several good-looking, amazing friends (male and female) who are inexplicably still single. Just because they aren't in a serious relationship doesn't mean they are "not good enough" by any means. Ideally I'd match them with each other, but I have no control beyond making introductions, which is done in the sneakiest way possible (no one likes the pressure associated with fixups).