There are definitely male-centric aspects to bandom (as there is in any fandom), but there are also people making a concerted effort to redress the imbalance. There is a community for bandgirls, which includes both female members of bands in bandom, such as VickyT from Cobra Starship and Greta Salpeter from The Hush Sound, and various wives and girlfriends, some of whom are famous in their own right. I've got a slightly conflicted attitude towards the idea of talking about wives and girlfriends who aren't public performers themselves - mostly they seem utterly cool people and I love their characterisation in fanon, but I'm also uncomfortable about using private people in fiction (whereas boys in bands are clearly begging to have porn written about them *g*). I don't think this is a more sexist fandom then any other, and I'd even go so far as to say that there's a lot more squee over the women in bandom than I've seen in most other places.