This is from what I've seen, so please take this with a heavy grain of salt. It's not necessarily nice guys, it's guys that are, like, unconfident in themselves. So when they go up to talk to a girl, their voice is, like, shaky and, like, unattractive. That's what makes them unattractive. But guys that are nice and confident and know their worth, they- they, like, get a lot of girls. It's just guys that are just unconfident. Like, that's what makes them unattractive. Like, really.