I can see that this discussion is going to get a lot of posts.

Are you talking about a team from an all-girls school? There isn't any problem with that, then.

A team from a co-ed school, though, is another matter. If there is another team at the same school that is all-male, it would still not work. (remember Plessy v. Ferguson?) I personally think they are a bad idea, because they cause tension whether or not they have a male counterpart, and because of society's view of all-male groups versus all-female groups, the practice of two teams would be condoned merely for the existence of the all-male group. Plus, there is not really any reason to split the teams.