Dear Parent,
Thank you for your letter.
I understand that you reached an agreement with your son some time ago that you could spank him with trousers down or naked, rather than more conventional modern punishments, which were not working.
You now tell me that at first this was very effective in improving his behaviour, but more recently it has lost its effect; and you ask what you should do.
It is not wise to become more severely violent. But you can work to increase his humiliation.
One way to do this would be to stop punishing him in his bedroom and have the punishments downstairs. There's something more shocking about being naked in the kitchen or the living room.
You could also make punishments more long drawn-out. Let there be a substantial gap between telling him he is to be punished and actually doing it. Some parents have their boy's trousers at the point they tell them and keep them downstairs in underpants until they are ready.
When you begin to punish, you could consider doing so by degrees. Start with the boy fully clothed and administer some spanks in this state. Then remove his trousers and shoes, turn back his shirt and spank some more on his underwear. Take off his shirt and repeat the exercise. Only then have him naked.
There is the possibility of keeping your boy in a state of undress or partial undress after the punishment. This can work.
And you can dress him in other embarrassing clothing before you spank. For example pajamas or unusual underwear.
Finally, if necessary, you can arrange for someone unknown to your son to add to his embarrassment either by being present to witness his spanking or to administer it whilst you watch. This can work well.
Remember that it is always best to negotiate with your son and offer alternatives. "I could keep you in for a week or...." And it also works to warn ahead, "Next time, I'll get someone here to spank you..." etc. Then he can't complain if you do...
Yours,
Spanking Adviser