Opposite sex introductions generally go ok in my experience and I've owned a LOT of bunnies. It's same sex introductions that cause the most issues. I've successfully paired up all sorts, my latest was neutered male to unspayed female. The only issue we had at all was that the female had a phantom pregnancy after the male humped her during the time they were sorting out who was boss.

My pairing before that was unspayed female to unspayed female... that had it's issues, but with perseverance we got there

Just introduce them on neutral ground, sit on the floor with them, give them treats, let them come to you and walk all over you. If you are physically there with them they are less likely to get into fights. Keep them separated the first night for definate, and then every night as long as it takes until you feel comfortable that they wont fight any more.

If you have a bunny pen, you could shut the male in there at night in her room, so they can still have contact with eachother, but can't actually get at eachother.

Good luck