AS you say, beauty IS in the eye of the beholder and when it comes to females like Serena Williams who I don't think anybody would class as truly stunning, they do have something quirky about them that some people will and do find attractive. I also think that her success as a lot to do with why people find her attractive, and while I understand this forum is about their actually look, at the same time the success of a person can also be something that people will admire and then that leads to an infatuation or a crush that they can't really explain.