I may not qualify as I was never diapered for punishment but was 
displayed most of one afternoon in my brief underpants by an 
exasperated mother.

My cousin was visiting and he could get me laughing so hard, I would 
wet myself. Upon the second occasion, Mom declared I could spend the 
rest of the afternoon in my "panties." At age 9, this was a very 
embarrassing development which my cousin, 10-11 and a neighbor boy--six 
months younger than I--exploited to their full amusement.

I tried to hide myself in the house while they were about, discussing 
me and my sissiness under an open window so I could hear their disdain. 
Then, while my mother was distracted in the garden, they found me and 
forced me outside to an area where we often played under a ragged tent 
and packing crate we used as a hideout. There they tied me up as a 
captive where I was subjected to blindfolding and groping, pinching, 
spanking, and fondling of my underpants. All the while, I was fighting 
my tears enduring the physical infliction, hearing myself described as 
a little panty boy, and being threatened with exposure. I begged them 
to let me go which they promised I would, if I would cooperate and 
endure one last humiliation.

They removed my tethers and the blindfold so I could see "what we're 
going to do to you now." To my horror, my neighbor was sneaking along 
the hedgerow with the Woods sister in tow. We met under giant fir where 
the girls were ushered so "you can see Tim in his underpants. He needs 
a good spanking." The younger of the two got scared and ran off, but 
the older girl requested the boys take my shirt off. Then she asked, 
"Why don't you pull his panties down?" The boys said they wouldn't 
because I might tell and they would get in trouble. "Well," said Gayla, 
"I won't in trouble so I guess I'm not only going to take your panties 
down, Tim, I'm going to take them off so then you'll be naked."

And with the boys providing the muscle and restraint, Gayla--who was 8-
9 at the time-- removed my underpants, smacked my bare behind a few 
times, and took off for home with my briefs as her prize. I ended up 
sneaking into the house after being pinched hard and poked to reinforce 
the boys' threats to "beat me up" if I said anything.

I tried to check those categories pertinent from your array. I look 
back on that afternoon as implanting my interests in submission, female 
domination, bondage, and humiliation. Why? I later engaged in manly 
arts and pursuits--boxing, shooting, blood sports, fast driving, binge 
drinking to affirm my manliness. Though it's often recited as in vogue 
from the spokespersons of popular culture and pop psychology--I'm 
uncomfortable with being a sensitive guy. Yet I am easily persuaded to 
play a passive, submissive role in relationships. Thanks for the forum.