well....talking fighting....yea every now and then, things wont be boaring and its a way of communicating.....its just disagreement. but often fighting? probaly not so good. physically fighting....not good at all and leave the relationship asap.
I prefer to call it having disagreements. Disagreements are normal for people who live together and have differences of opinion, nothing wrong with that. Fighting where people lose their tempers are not okay and will damage relationships over time. Physical fighting between partners...absolutely forbidden! Learn to communicate with respect and the disagreements go down in number and intensity.