Hormones are merely area of the tale.
It's probably took place for your requirements: you are in a relationship, the intercourse is very good, and then—for one reason or another—it dries up. You are probably understanding in the beginning; perhaps your lover's been stressed in the office. Then again you begin getting only a little upset. Resentful. Even aggravated. Quickly, you are primed for the fight—the kind that begins with, "we consider it is funny that…" and stops with someone throwing and switching regarding the family area sofa you have been meaning to restore for the extremely reason why you can't really sleep on.