I have a very vague memory of this, probably due to how young I was and me repressing it, but when I was 6 years old I remember that my brother, then 13, got undressed for some reason. He then asked if he could see mine but I didn’t want to. He convinced me and when I showed it to him he made me stand up on the ottoman in our living room so he could touch our penises together. He made fun of me because his was bigger than mine, and I ran away crying.