I don't know if this has been asked before...

Well there's nothing in canon that says she can't...I don't see why she wouldn't be able to change, you know, there, lol. But I don't think she'll be able to change what's actually INSIDE her, her internal organs etc, which is what counts really. I suspect she'll only be able to change her outward appearance, not bodily functions.
Good question X)

I don't think so. I suppose she can only change her physical appearance. So, maybe she could look like a man, but not change her sex.

dont think so to find out try harrypotterfacts.com

yes,she can


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lol nicee!
well probably, i mean, it never says she cant! However, why would you want to become a man? After all, she is in love with Lupin, so it would just be weird if she turned herself into a man...