Husbands in spanking art
Most societies have a history based on the principle of patriarchy; therefore husbands would traditionally have authority over their wifes. This included (in some non-western countries to the present day) the husband's legal right to administer corporal punishment to his wife when felt necessary. When this is done by agreement, is is often called domestic discipline.
This scenario is often reflected in M/F spanking art, particularly when it comes to photography such as those published in spanking magazines. However, due to the fact that many men enjoy the opposite (women dominating men), there is also a lot of F/M or femdom spanking art.