Girls in BJJ

I know that my friends are by no means "maarte" or girly girls but I wonder what is it about BJJ that they don't find appealing? Maybe if I told them this guy did it, they'd join...

He really does do BJJ! Look, he won a competition!

"It’s said that 95% of all fights go to the ground and BJJ is the only martial art I’ve found that teaches you how to get a larger, stronger, and potentially faster attacker off of you. I believe that all women and girls should train BJJ; it’s important to be able to protect yourself!" (Taken from http://www.88bjj.com/) Let's go, GIRLS!