I think the male feminist / feminist ally business can also get tied up in issues of the the necessity of male approval of the feminist cause. I had very mixed feelings about the "this is what a feminist looks like" t-shirts that did the rounds a few years ago. A quick google image search confirms my impression at the time, which was that the most prominent images were those of middle-class white men wearing that t-shirt.
Patrick Stewart was one of the more famous (from my POV as a lover of Star Trek, anyway
) examples, and he's also quoted as saying:
"People won't listen to you or take you seriously unless you're an old white man, and since I'm an old white man I'm going to use that to help the people who need it."
On the one hand, massive kudos and respect to him for taking that stance. On the other hand, people ought to listen to the feminist message because of its own merits - not because the torch is being taken up by men. The "this is what a feminist looks like" campaign felt very ambivalent to me as an underlying - and I'm sure unintended - message seemed to be that feminism could only be mainstream and acceptable once men had got in on it.
I don't know, it is tricky. I think there's a conflict between the fact that feminism is a movement largely about women's experiences and trying to improve those experiences, and women need to have the space and voice within that movement to say - this is what we have experienced, this is what we need to see change - and bringing men, as the very significant other side of the coin, onboard.
I think that feminist men do need to be extraordinarily sensitive to the fact that, whilst as individuals they may be incredibly thoughtful and kind people, they - just like women - have been raised within a patriarchal society and therefore may unintentionally continue to enact traditional power dynamics even within feminist debate, which is problematic.
I remember attending a feminist conference a few years ago and there was one man in the room. He looked quite nervous throughout and my first instinct was to think "hmm, well done him!" Then my next thought was - why should I have thought that? The fact that he's a man at a feminist conference doesn't make him any more or less special than all of the women in the room.
Sorry, that was rambly! Time to get back to my thesis...