I did this!!
I am in my mid-thirties and this has never ever happened - never even been close...
I read all the threads that mention such things with AVID interest, and I have read before that once you know that it is possible that you can do it again - I hope so...
Know that I am over-sharing but do not have any RL friend that I discuss sex with (even though I am a big fan)
Key for me - if anyone is interested was, no alcohol, relaxed , big, long build up, kissing/non-sexual touching, orgasm through stimulation, DP laid totally flat me on top. Bingo, one very happy girl 