Has anyone ever actually participated in double penetration?

I tried once but we found it logistically much more difficult than porn would lead you to believe... Just like, the angles, getting everything lined up, synchronized... 😅

Not since high school.

It was a birthday present for my girlfriend at the time. Had a friend join in.

My wife and I have done it using a dildo or plug as the other one, never with a person

Yeah, I was at a gangbang and one of the women wanted a DP. For whatever reason, I ended up being part of it. She was riding me and another guy was in the doggy position.

Can't say it did anything much for me personally. I'd quite happily do it again, either in the same situation or if a partner wanted it, but I wouldn't go out of my way. I'm glad I did it once at least, just to have the experience.