I am sorry, read the rules only now and noticed that I can speak about only sex I have had as an adult.
Well, I try to write short this time 
Amazing orgasms have been many, i cant pick just 1.
-when I had my first multiorgasm ever
-when I had first very long and strong orgasm ever, did not know earlier that orgasm can last minutes. It lasted about 15 minutes, and I was scared, thought I may die but could not stop. From that started ‘new world’ in my sexuality.
-longest 1 orgasm i have had measured, lasted 40 (!) minutes.
-I tried once, how many orgasms I am able to get in one session, where is my limit. I got 100 orgasms, and then my ex stopped pleasing so I dont know my limit. But it was so painful already, that I dont want to try anymore. I was tied up, eyes closed, and he pleased me in many ways: whispering naughty things, tickling, touching, cunnilingus, fucking, using toys, vibrator, feather etc.
-Sometimes when I orgasm, I feel like i am filled with warm light and love, lovely feeling
-sometimes i have felt my vagina is on fire, love it
-sometimes I have had out-of-body experience due to very good orgasm.