More than once unfortunately. I wasn't sure if i wanted to tell these stories but I'm comfortable here now so what the hell:
One occurred when I was going to have what I thought would be my first physical without my mom present. I must have been almost 15 because it was right after my 8th grade graduation.
My mom took me to the pediatrician and when I was called I went into the exam room by myself. The doctor did the normal physical. I always got nervous when he had me lying on my back to palpate my abdomen. I started to breathe in an out quickly as he pulled down the band of my tighty whiteys. He then had me stand up to do the hernia exam. On this occasion, he pulled down my briefs down to my thighs, but they slipped over the thickest part and dropped to the floor. He cupped my balls and did the exam. When he was finished I started to reach for my briefs but he told me to leave them off. He sat down on a stool and wheeled over. This was new! He took my scrotum in his hand and started to roll my testicles between his fingers. Then he palpated the shaft and used his fingers to gently spread my urinary meatus. He asked me if was sexually active. "No." (!) He asked if I have erections "Yes." He asked if I have ever ejaculated. "I don't know" I said. I hadn't but I was embarrassed. He went on to explain what ejaculating is and asked again. "I don't think so." I said. The answer was still no haha.
I didn't know it at the time but he was checking my pubertal development, which was to say I had little to no external signs of the onset of puberty (late bloomer).
The doctor then informed me to sit tight and he'd be right back. I put my briefs back on. A few minutes later there was a knock on the door and the doctor came back in... trailed by my mom. I looked at her first in surprise/horror and then silent fury. Turns out my mom was concerned about my lack of entering puberty and had asked doc to give her an update on my 'development.'
The doctor said 'Your mom wants to make sure you're healthy so we're going to review part of the exam if you don't mind.' I definitely did mind but I was too mad and shocked to say anything. He asked me to stand up again while my mom took a seat directly across from me. I was was perhaps obedient to a fault. He asked me to remove my briefs, which I did with shaking hands. I was now standing fully nude in front of my mom. The doctor again took my scrotum in his hand and rolled the testicles, explaining to my mom that once puberty hit they would grow in size and hang lower. He demonstrated by lifting and lowering my balls. He said the skin on my scrotum may start to darken. He then ran his hand along my inner thighs and base of my penis, indicating where the pubic hair would begin to develop. It was this contact that started to give me an erection. He continued by saying that I would start having more frequent erections (that was apparent!) and may have my first nocturnal emission or 'wet dream.'
My mom asked him if it was okay that I hadn't started puberty then, an he said, yes it is normal, he said he thought I would start soon. He told my mom that we could do a 'home evaluation' in the fall, and if I was still not showing development to make another appointment.
Anywho, it seemed shortly there after I started noticing wispy hair growing on my sac. Summer turned into fall and I started high school. My mom normally woke me up everyday for school since I didn't use an alarm clock.
One morning she woke me up and I threw back the covers. I felt wet on my crotch and looked down to see a dark spot on my boxers (I slept in boxers). I looked up and pretended nothing was wrong and walked quickly to the bathroom. I was hoping my mom hadn't seen.
I got to the bathroom and closed the door, dropped my shorts and inspected the large amount of semen in the front of my boxers. I quickly started the shower, but there was a knock on the door. I threw a towel around my waist as my mom entered without further warning. She closed the door behind her.
"I need to check your development like the doctor said, honey." I just stood there. "I promise it will be quick, i'll just peek." She said. "I just want to make sure you're healhy." My face was bright red, but reluctantly I lowered the towel. She lowered the lid on the toiled and sat down, and asked me to step towards her. "You've got hair honey!" (No shit!) but that made me blush brighter. She stood up and picked up my boxers. "i'll wash these for you" she said as she left.