LOL!
Yes... or at least the closest I've come to "Unexpected Accidental Orgasm" since just entering puberty.

Recently I'm on a medication that has a side-effect of substantially curtailing my rather high sex drive. Reduced down to what many men my age would consider a "normal" sex drive.

So it had been nearly a week and a half since I'd had an orgasm. My wife was standing at the kitchen sink I walked up behind her and hugged her whispering in her ear that we really needed some intimate time soon. It was natural to rub against her butt then. I was surprised that I got an erection so quickly (almost instantly) and then within just a few seconds had substantially spotted my pants with precum. I did pull away just before orgasm but I was very surprised that it would have happened so quickly... I've never before been a "Minute Man". We did get intimate later and my orgasm then, lasted as long as or longer than any single orgasms I'd had in recent memory. less