I currently have a spayed female and an unneutered male. My plan was to bond them, thinking that Raph would not need to be neutered, as his testicles never descended and he was the most passive, lovable rabbit I'd ever seen. However, after introducing him to Anna, Raph's testosterone proved to be raging, as he began spraying and attempting to mount her. They cannot be kept in the same cage, but I do let them loose in the yard together. Raph still runs after Anna, but because he has a leg condition, he can't keep up with her, and he certainly couldn't mount her, so he doesn't bother her very much. (Despite this annoyance, Anna actually seems to enjoy his company when they are loose.) Unfortunately, because of Anna's presence Raph has become extremely territorial and will charge at my cats or myself when we are in the yard, in an effort to protect Anna from us.
So I wouldn't recommend attempting to bond an unneutered buck with a spayed doe, at least based upon what I've seen...I agree with Naturestee; it would be best if you could bond your girl with a neutered male instead, if possible.