I don't remember my toddler years: before 2.5, but knowing it was customary to examine anyone under the age of three naked in the good old Soviet Union, I suppose the doctor did check my boy parts. I just don't remember any well-check visits. Only house calls and followups for flu, bronchitis, pneumonia, scarlet fever, chicken pox, and other childhood ailments, which obviously didn't require genital examination. Absolutely all pediatricians were female at that time, not to mention their nurses.
The next time I had my boy parts felt was around nine. My mom took me to the local pediatric clinic's resident "surgeon": a muscle/skeletal, reproductive, and perhaps other organs specialist rather than a scalpel-wielding operation room star. I don't know why both have the same titles over there. A female of course. I'm not making that up. The majority of physicians were women at that time. Somehow medical care was considered female occupation. And still is in my mind. I do trust hairy and brute male surgeons, but when it comes to regular physicians and especially dentists, I prefer the light and careful female touch.
I don't remember what brought us there, but I vividly remember that visit. Not sure how Russian clinics look now: perhaps mimic the Western setup with a pool of exam rooms. But back then every doctor had her own office, where she saw the patients. The nurses were typically assigned too, so they had their own desk in the same office. Another mom with an appr. 7-8y.o. boy just left the room. She looked somewhat distressed, briefly looking at my mom (we were next) and saying to my best recollection: "What the heck she thought she was doing? One more time and she'd turn him into a masturbator." ("onanist" in Russian). What is the official term for masturbation phobia? You know, the threats of going blind or growing hair on your palms.
I had discovered the joy by that age, but I had no idea about the official term. Glanced at my college-educated mom, who was embarrassed, and obviously not going to explain to me what that direct blue-collar woman meant. I just knew it was something embarrassing and unpleasant, having heard stories, that the "surgeon" makes you remove your underwear and touches your boy parts.
A couple years later I finally understood, that was the mere act of pulling back the foreskin. No one (thankfully) circumcised boys back then, and it was very common to have a tight foreskin even at that age. Mine was. She tried and gave up, telling my mom (with a grumpy look) that she should have taken care of that during my baths long time ago.
That was it. The next time I had that kind of physical was last year (in the US). And that was the first time anyone invaded my bum hole. I had never ever had a finger or thermometer inserted there, as far, as I remember my childhood.