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... Was there ever a time when multiple individuals or everyone had a red bottom?
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In my parents' home, when I was growing up with my two sisters, and in my home when my wife and I were raising our three children (two sons and a daughter), there were definitely times when more than one family member required discipline. My father (and his father before him) believed strongly in what Grandpa called Biblical Family Discipline -- Grandpa was a pastor.
When family members broke the rules, there were always consequences (various forms of corrections and punishments). It was often deemed necessary to administer corporal punishment for significant or repeated disobedience, disrespect, and/or dishonesty. Proper family discipline was always a family affair, and when proper bare-bottomed spankings were administered, the entire family was frequently present.
For example, my sisters and I frequently witnessed each other's spankings. We also sometimes witnessed our father punishing our mother, and vice-versa. There were a few occasions when all members of the family were simultaneously awarded disciplinary appointments in Dad's workshop, where a wooden paddle and a leather strap were always hanging on the wall. Because every family member was expected to follow family rules and was punished for misbehavior -- and because family discipline was structured/fair and transparently/lovingly administered -- my sisters and I never resented our punishments.
I was fortunate to marry my high school sweetheart. Our families attended the same church, and she was also raised by parents who practiced Biblical Family Discipline (BFD).
I would describe BFD families as slightly, but not totally, patriarchal. Although the Husband/Father is generally considered the head of the household in a BFD household, he is not supposed to be a dictator. He is supposed to lead the family unit by overseeing, with a degree of democratic participation from his family, the governance of the family. He is certainly NOT supposed to be exempt from following the rules, nor from the consequences of breaking the rules. This differs significantly from the modern versions of Domestic Discipline (DD), which are almost always entirely patriarchal (i.e., "Christian Domestic Discipline" -- CDD) or entirely matriarchal (i.e., Female Led Relationships), and seem often to be primarily very sexually kinky lifestyles.
Don't get me wrong... IMHO, there is nothing wrong with a Husband and Wife enjoying some consensual sexual kinkiness, which might include things like dominance/submission, power exchange, erotic spanking, BDSM, etc. But, implementing and maintaining Family Discipline is not primarily sexual in nature. The purpose of Biblical Family Discipline (including good old fashioned proper soankings, when necessary) is to raise/train self-disciplined children, provide for marital accountability/discipline, and to help create and nurture a strong and loving family unit, built upon strong family values and a morally righteous foundation.
Of course, as human beings, we are are inevitably going to be aware of the various sexual undertones that are almost always present in many human interactions and activities. Examples (from the perspective of a straight male), ...
1> It is almost impossible for me to not notice a beautiful woman, but of course I must control myself...
2> ... (especially, a young lady wearing a sexy sundress, or a sexy swimsuit at the beach! -- However, my reason for going to the beach is not to notice sexy girls, but it is inevitable, so I must contol myself).
3> There have been occasions when I was unable to prevent my biological sexual arousal (erection) when being examined by a young female medical doctor. -- My reason for going to the doctor is not to experience sexual arousal, but it is inevitable when the young female doctor tells me to take off my underpants and she is examining my genitalia.
4> Similarly, when my wife punishes me with her hair brush or the razor strop, I almost always have an erection before laying my naked body over her lap or bending over the workbench. -- My wife's reason for punishing me (and my reason for submitting to her authority to discipline me when I deserve it) is not to experience sexual arousal, but when I have to strip naked in front of her, fetch the paddle or the strap, and stand naked in front of her while she lectures me, my erection is inevitable.
There are MANY situations that call for human beings to exercise as much self-control as possible regarding sexual arousal/temptation. We cannot always have complete self-control over our biology (male erections being the most obvious example), but we can-and-should exercise self-control over our behaviors. Family Discipline actually helps teach and enforce self-control over inappropriate behaviors, including sexual misbehavior.
As a boy, my sisters (and cousins) and I were sometimes spanked together. During adolescence, my sisters and female cousins developed into very beautiful young women. When we had to strip naked together for a whipping, my male cousins and I would inevitably get hard watching the naked tween/teen girls being punished, but obviously this did not mean that we had underlying romantic/sexual interests in our sisters/cousins (they had sexy female bodies and our male bodies simply reacted accordingly). Likewise, while less obvious, the girls also experienced some sexual arousal when we were all required to strip naked together, and they saw their brothers/cousins standing there with hard penises. Our parents taught us about biological sexual arousal, so we understood what was happening. So, although our spankings were embarrassing and painful, we learned to have self-control and to accept our punishments.
So now, to answer the originally posted question...
When I spank my wife (and vice-versa) during kinky sexual encounters, it is a mutually pleasurable activity. For us, erotic spanking is never as severe as disciplinary spanking. Of course, these erotic spankings must sting, otherwise what is point? Administering pleasurable pain is an art (not a science). We do not always incorporate erotic spanking into our love-making, but when we do, we each emotionally and sexually enjoy the experience of spanking and being spanked.
Disciplinary spanking is entirely different, because it has an entirely different purpose. Administering disciplinary pain (punishment) is a science (not an art). For us, practicing Family Discipline is not exactly pleasurable. We do it because we experience the benefits individually, and the beneficial impacts for our marriage and for our family. I do not emotionally nor sexually enjoy punishing my wife and/or children, but she and I both believe that srtict marital and family discipline are beneficial. A proper bare-bottomed disciplinary tanning with a leather strap is very painful, but never abusive. I will not deny that there are some sexual undertones involved when my wife is required to strip naked, fetch the strap, and stand in front of me while I lecture her. Seeing my wife naked and and exercising my authority over her almost always causes me to experience biological sexual arousal. Likewise, stripping naked and submitting to my authority almost always causes by wife to experience some biological sexual arousal. However, I am always feeling a lot of sadness and compassion for her when I have to administer the punishments that she deserves. She and my daughter usually cry when I have to whip them, and I sometimes cry while I am punishing them (because I know that I am causing them to experience some painful discipline). My daughter is in her mid-20's now and still living at home. She has never complained about having to accept her discipline when she deserves it. Of course, it almost never happens anymore, because growing up in a family that practices strict family discipline has helped to train her that the best way to avoid the strap is to behave herself in the first place (exercising SELF-control and SELF-discipline is always the best way to avoid receiving humbling and painful discipline from others in authority).