How old was the "youngest" sexual partner you've had?

Nine years old.

Nice

Ten at Twenty One

I was 16, she was 13. We were playing truth or dare. It was both our first time.

My cousins and I were 16and my little cousins who are twins were 13 and thier sisters let us fuck them one night when our parents were out drinking. And the oldest woman I fucked was my friends grama who was 72 .she gave me 20 dollars for doing

While visiting family in Norway when I was about fifteen I pressured my ten year old girl cousin to let me do anal sex to her when we were alone together in the sauna. I was gentle and she tolerated it but after ejaculating in her I sort of came to my senses and realized she could tell my uncle and my mom. I was in that first stage of utter panic when she actually admitted to me that she had done anal sex before with her brother, my cousin, several times.

She insisted that I should go into the house first and she'd follow after turning off the sauna. Dinner was incredibly awkward for me but she acted like nothing happened. We left the next morning back home. It's been well over a decade since I was in Norway. My father informed me she recently got married and her brother, my boy cousin, came out as gay to his family.

I was 17 and my foster sister was 15 when she caught me having a wank. She was standing at the room door watching me whilst playing with herself. I told her to come join me on my bed. As we played with ourselves i said her pussy looked amazing and she said that it would look even better with my cock inside her. I was the 1st guy to fuck her and it felt so good fucking her

10, my sis and I was 17 but ejaculated without full penetration!

In my mid twenties, when I had my first room mate free apartment, I had three separate secret sexual engagements with a precocious eleven year old chubby girl who's parents lived in the same building.

Details

Years ago, she was 5 squared - 10 but I found out after the fact since it was pretty much "don't ask, don't tell." and it was the best encounter I've had. She was already sexually active and she let me have my way with her for an entire afternoon. We finished so sweaty that you would've thought we just got out the shower. I didn't want to risk cumming inside of her so I finished in her other hole, which was surprisingly easy to enter. I've never came so many times in a day. Unfortunately, I met someone I got serious with and I went on the straight and narrow with pedestrian sex and those kind of encounters are just memories for the spank bank. She was a real trooper and a sweet girl (but I suspect she was the neighborhood bike). My age back then, you ask? Haha...