Thank you, I did not know that and a quick google gives me plenty of links to start on.

It reminds me of when I was a "Cub", we had a couple of girl members and several female leaders. I didn't think anything of it at the time but I remember one lunch time one of the girl cubs (who went to my school) grabbed me (literally - she was two years older and bigger!) from playing football so I could tell a dinner lady who didn't believe that she was a cub. It was all in good fun but actually before that moment I'd never really got that one was for girls and one was for boys, I just thought you could choose freely. And, well, I suppose you can!