Football is a physical contact sport which was invented and designed for a man's body.
The testosterone levels of typical males are much higher than that of a woman's, which allows them to cope with the everyday physical strain involved with the nature of the sport. It has been proven that a female cannot compete at the same intesity as a male, simply because their bodies will not allow it. Also, a woman's figure has certain external features that make it very difficult to comply with. A woman competing against men in pro football is only asking for disaster. Some men in the pros even suffer from career-ending injuries while competing.