Superheroes

In most superhero movies there is a hero and a villain. The common occurrence is a male hero and a male villain. Every once in a while there will be a female villain or possibly one as a hero sidekick. There are so many strong powerful women out there, why can't there be a kick butt female super hero who can beat the bad guy and still live day to day like all the other superheroes. Even in the movie Watchmen they have female superheroes, but it seems like they are just used as a sex symbol instead of figures who can actually take care of themselves. They always make sure the female superheroes have someone with them so they aren't alone and left vulnerable. If they are really that amazing can't they take care of themselves. Everyone has the perception that women can't be as strong as men or that they can't take care of themselves, but just becuase they are not physically the same doesn't mean a female superhero couldn't be just as powerful as a male superhero. They both have mythical non-existent powers and strength anyway so why not give that full ability to a female superhero.