For me, it was when I was 15, when my Grandmother, and a dear, close family friend (who I did not remember, because I didn't remember much of anything that happened when I was an infant) were fitting me for clothes Mrs. DeVries son had outgrown. It was as invasive as any medical exam I had ever had, as Grandma bent me over double, in front of Mrs. DeVries and apologized to her friend for not doing this earlier, and lowered my underwear too my knees, spread my my cheeks, and proceeded too check my hygiene to keep the white cotton briefs clean (summer heat index over 100 degrees, dew point in the lower 90's) and fortunately, I was already fully erected from being completely nude and moved around (genitals lifted, pulled aside and measured, with briefs being pulled up, fitting then for snugness between skin and fabric, and such) and spanked nude over Grandma's knee for attitude adjustment over my shyness coming across as petulant rebellion against them seeing me naked, rather then fear of what respect of theirs I would lose for them to see me that way. If erecting against Mrs. Devries and Grandma's fingers didn't put me in my place a few minutes earlier, being being expected to carry on a normal conversation and answer questions they asked me while grandma opened my urethra and looked inside my penis while Mr freeze pulled my scrotal sack toward her face to get a close look complimenting me on my hygiene being good during that time of year as she ran her right thumb pad over my scrotal sack and felt along the base of my genitals, fingers through the pubic hair, pulling both testicles back toward her face and smelling my testicles for any signs of odor, I learned what true humiliation was when some semen dribbled out of my erect penis while grandma was inspecting under the glands for signs of smegma or build up, commenting about it to Mrs. Devries while taking tissue and wiping rhe tip off, I couldn't bring myself to admit that the contact of her nose tip to my testicles that she took a long wiff, humiliated me to the point of mortification, because of how vulnerable and helpless I felt in that exposure. I think hearing them refer to these areas as my private parts, when I had no privacy at all from their view and touch, made my humiliation complete, as it was acknowledged that these parts were only private to young ladies my own age who I don't know and to strangers but not to family and friends of the family, where privacy is neither an entitlement, or necessity, for males when in company of family members and acquaintances of the family. Why my testicles are being sniffed and rubbed by Mr freeze fingers I thanked her for their compliment she's very kind and tried to think of the situation the way I pretended to think of it which was that I was pretending to be proud of my good hygiene being noticed, rather than ashamed of my boy parts being held and handled in such a casual cavalier manner, and my rectal opening being penetrated by an injection middle fingers of both to check for health and hygiene supposedly, but in reality I think that in the prolonged and invasive matter of eat testicular and penis inspection was a disciplinary action to teach me respect for my elders and family members and Friends of the family who changed my diapers when I was little, even though I didn't remember that. By the time I was said and done a couple hours later I had learned as much of the humility they wanted me to learn and did not forget that lesson for next time I needed clothes fitted or health or hygiene related inspections and examinations. The next time I was told to strip off, I did so without hesitation or complaint.