The First Woman I saw Nude was my Aunt
I saw my aunt fully nude one day when I was about 6 years old. She was changing after a shower, and I saw her reflection in a long mirror that ran along the room I was in.
The mirror was adjacent to a doorway that connected her bedroom (the room where I was) to an adjacent bedroom she walked into. She only closed the door about 2/3 of the way, just enough to give herself privacy from my eyes, but she was oblivious to the giant mirror.
I saw everything, and it was incredible. She had large tits with big, pink nipples and large areolas, and as she removed her towel and dried herself off I was mesmerized by their movement; how hard her nipples stood in the quiet bedroom air. When she dried her back, she revealed an incredible dark brown bush that has made me a fan of hairy pussy ever since the reveal. It was a wide, thick triangle that came to a soft point against her white thighs.
I remember her drying her pussy off with the same towel she had just use to conceal her torso from me only seconds ago, and as she did, she turned her body to the side and I saw the curves of her profile around the post-shower fullness of her bush protruding beyond her upper thigh. This was in maybe 1987, before women were made to feel more feminine if they shaved their gorgeous bushes away.
She was beautiful. Only beautiful. It was just the most amazing sight I could ever imagine and cemented lifelong powerful sexual turn-ons for me in an instant.
She dressed, and left the room, apparently never noticing my gawk at her beautiful, natural body.
Thanks to her obliviousness (or just lack of real diligence) I'd also get glimpses - and sometimes long gazes - of her pussy some years later when I was a teen. She was (obviously) older now then when I first saw her naked, maybe in her early 40s, and she had gained some weight, but still looked good.
So, I'd spend a lot of time at her house after school was over. Around bedtime, she'd frequently go about in nothing but a long tee shirt that dropped maybe to her mid-thigh, but rode up whenever she bent over or sat down in certain positions, and... suddenly, there was her pubes barely concealing a darker labia. I'd position myself strategically to get better glances, always keeping track of where she was going, what she was about to do. She kept her pussy hairy and never shaved herself. I remember seeing her bend over one time, and revealing the very bottom of her ass and her pussy hair sprouting from her taint and disappearing up between her cheeks. My cock got instantly hard. I laid on the floor one time "watching T.V" as she tidied up a mess of her children's toys that I had made, and she gave me an extended view of a legs-parted, squatting, pussy view hovering just behind my head. I looked up, and I saw everything -Everything. The color of her lips, her hairy asshole, pussy-pink with a bit of sheen. Just everything. I was in my early teens at the time and it would drive me insane. Gallons of my cum was sprayed at various places in her house, mostly her bathroom, or the bedroom I was sleeping in that night. I constantly masturbated while reliving what I witnessed in my mind let the inevitable fantasy take over. I used to feel shame for doing it at the time, but I couldn't help it.
Eventually I got over it and simply accepted it as a fundamental function of my sexuality, and at the end of the day, no one was ever hurt over it. I was always a very sexual person who was absolutely captivated by the body of a woman, and my hormones were raging at the time. Being in the mindframe that comes with puberty is like being on hard drugs. Also, any opportunity I had to see a woman naked in person, any consensual signal potentially broadcast which could lead to the real experience, I was completely oblivious of. In those quaking moments, pussy was pussy, and pussy and women are infinitely beautiful and sexy. I consider myself lucky to have such a wonderful woman in my life, for the reasons of her casual obliviousness, and of her infinite love. Those early experiences of my aunt will always be with me, and will always be a part of my sexuality.