When I was between 7 and 9, I recall going into the shed, or other out of the way places, with brother, step brothers, neighbours boys. All or some of them. They varied in age from same age as me to 5 yes older. We would show each other our 'bits' and they boys would press their penises to my vagina. Nothing internal AFAIK. Sometimes they told me to kiss their penises and they would do the same back.
I can't remember if they had erections. I don't recall being 'made' to do it. Looking back, I really really don't know what to make of it.