Like girls who are known to be sluts and yet every guy wants them. These girls are complete b_itches as well so it can't be about their personality.
Most Helpful Girl
I feel like there's a deeper question to look at here, or angle. Why does it matter to you if these girls have boyfriends, despite not meeting your aesthetic standards? So long as those in the relationship are satisfied, does it not matter? Aesthetic beauty and attraction are two very different things, and should not be confused, and yet I believe they are here.
I personally find that many girls who frequent between boys tend to have low self esteems, and do not value themselves. Therefore, they are more inclined to lash out at others to compensate for their low self-value, and they are also more inclined to gravitate toward males and be in a relationship. It is kind of heartbreaking, actually, that they put more effort then into harming others rather than bettering themselves as individuals.
As for the boys, it also varies, but my guess would be that, conscious behavior or not, they see girls who are attracted to them, stroke their egos, and are easy sexual access which tends to be a high priority. They also can sense if a girl does not value herself highly or not, and that can easily taken advantage of.
In conclusion, I find that there is a lot of animosity, and maybe jealousy coming up from this question. If there's a hidden question of "why don't I have a boyfriend?" Well, do you want the kinds of relationships that these girls have? My guess is no, and that is because you value yourself. And, your value, no one's value, is based upon whether or not they have a significant other. Eventually you'll find a significant other, with the same passions and values as you. The king thing is not to settle just for the sake of a relationship, like many of these girls may be doing.
And maybe practice some compassion, for yourself and for them :)0