Well I am a girl and I'm responding anyways since the "girl gamer" stereotype is that we all look like wanna-be goths or nerds.
I am neither. I am what you might call, average to slightly below average looking. I blend in with crowds. I dress very "normal".
I am not thin, fat or freakishly tall or short. I am 5'5 and I weigh about 125. I will be the first to say I am not "ugly" but also the first to say I am not "pretty".
I just kinda am.
Most people wouldn't guess I played DnD by how I looked (although the numerous pictures of elves, dragons, faeries , wizards and unicorns at my cube at work might tip them off).
My boyfriend, also a gamer, you know him as MojoGM, doesn't fit any of the stereotypes either. He is what most women would describe as at least above average looking (this is based off every woman I know who has met him) and many would refer to him as downright "hot".
Most people wouldn't automatically assume he plays D&D (although the fact that he spends 2/3 of his work day writing our next game session and/or on ENWorld might tip them off...)
I'm not just saying this because I'm with him. He's just a damn good looking guy. We don't really "match" physically (he turns heads...I don't ; but I'm cool with that

), and we're happy. And that's all that counts
Of course attractiveness is really just in the eye of the beholder. I know some women who dig scrawny pale guys, and some who really like tall, heavyset guys. I think it really just comes down to how you present yourself. And your attitude.
I tend to make my characters look average. I see no need to aim for the typical "sexy chainmail bikini look". Maybe that's just too much of a reach for me...