Unless your goal is to first get across to a segment of the audience that girls do play the game, since there is at least a historical segment of the potential audience that views D&D as a boys-only game.
We don't even have to spend a lot of energy looking through old threads to find examples of why this might be so. I think there was even a thread in 2007 where the OP declared that he wouldn't allow women into his game.
So, yeah, there is a reason to establish that women do game. Now, the message may not be necessary for you, but it's not a message without some value.