It's a shame she's not good looking? Well, not really. Football is not based around looks, it's about playing your role, and doing it right. Men and woman can both learn the statistics of football the same, it makes no difference. The referee will do what is fair. If a yellow/red card is to be issued, then she shall give it regardless.
Personally, I wouldn't see women as being referee's for several reasons listed above. Like there is sometimes alot of fights on that pitch, that woman may not be able to handle. Regardless of that, I am not sexist and I believe if a woman wants to be the referee of a male footballers game, then she should be allowed without the warrant of critism.