Hotspur:
defiant: I usually tell my wife that I have a work related social activity...
Have you ever thought about telling the truth?
Ideally, a person should, but if he were anticipating a serious negative reaction there could be marital problems as a result.
My personal perspective is that a spouse who won't make at least a modest effort to meet his/her partner's spankophile desires shouldn't emulate Aesop's dog, barking in that manger, if that partner wishes to engage in spanking play elsewhere.
However, since spankophiles obviously do sexualize their spankings (given and/or received), some vanilla spouses undoubtedly would consider their mates' engaging in non-marital spanking play to be "cheating" on them.
Of course, if a spankophile is primarily 'bottomish' and enjoys undergoing rather strenuous wallopings, outside-of-the-household playtime generally leaves colorful 'evidence' that it hardly requires Nancy Drew to uncover...

--C.K.