Relationships and nasty fights, how many do you have a month?

I know people some even family who are very irked over the fact that my fiancée and I may have a few points where we disagree but we don’t argue over them or get into knock down drag out shouting matches that many, many others seem to have. How strange to you believe it is for a couple not to have arguments are vicious nasty fights? I am told that you HAVE to have those nasty fights in order to come together, find common ground. Do you believe that? Is that what works for you? What do you believe the yearly average of nasty fights constitute a “healthy relationship”?