Found 'The Three F's Of Marriage'

Came across a article on marriage - a quick read and a worthy consideration: The Three F's Of Marriage - Marriage - Families.com

those three Fs let us disagree and they let us fight and they help us to reach compromises and harmony when we need to.
Do you have the three Fs in your marriage?

What do you think the F's are? Are they the same that you experience? Can you think of others?