Really, there's no such thing as 'girl sports' and 'boy sports'. Anyone can and should be allowed to play anything they want, regardless of gender. Human society has become so categorized, so based upon meaningless words we have assigned to people so that there is less competition and a select group of people can pretend they win everything, that some people won't even try something thinking it is not for their 'category'. So anyone should be able to do anything they want.
I think girls should be able to play with boys because one there is no suck thing as a boy sports or a girl sports. Secondly girls are just capable of playing with the boys. Third reason girls are really good at playing sports to why do we look down on girls they are human to we all are equal to each other so stop looking down on them. It is time to stop with that's a boy sport and that's a girls because THERE IS NO SUCH THING OF A BOY SPORT AND GIRL SPORT. Lastly girls can kick boys butt in a sport so anytime any where. And girls can play in football too not only boys are strong and tough but girls are too.
What do you mean "boy sport"? Please give an example of a sport that girls are not allowed to play. Because I will be very surprised if you can come up with a sport that boys play that girls are not allowed to play. And don't say football, because girls can play football.
I assume you mean play WITH boys, otherwise it's a non-issue as any sport boys play, so can girls.
There are physical differences between boys and girls that can't be overlooked. At peak fitness, men will always be superior in upper body strength. It's just the ways human bodies are designed. This puts girls at a disadvantage and increases their risk of injury.
Even if you have a few exceptional girls who are physically capable, you have added social stigma against hitting or being aggressive against girls. Not many boys will want to go "all out" against a female opponent if the sport involves physical contact. This does NOT mean there aren't sports that both boys and girls can play together, it just means there will be a few sports that should remain separate.