Are you planning on the babies? You should fix your bunnies. The female may get aggressive while making her nest and the male gets very excited and may have pull her hair because of it. They are very gentle docile loving pets if you treat them with kindness.
Maybe they are rough natured when mating just like Ducks. The Drake often breaks one or both wings when he's in the heat of passion. He does to all available female ducks as well as biting them on the back of the neck to stop them moving. It's not a loving act for the female ducks.