I was still in high school, back in the early-mid 70's, and in the summer between my junior and senior year I occasionally scampered over the backyard fence to the neighbor's pool, a single 50-year old woman. I always did this between 11:30 pm and midnight, as I knew she got back at 2 am or later and didn't want her to see the pool still sloshing water as it does after use. At first I swam with trunks, but knowing she didn't ever come home early I became a bit bolder and swam nude.
It was great. To be honest, I looked forward to the time I could sneak to her pool most nights. And weather permitting (rarely got too cold in June in so Calif), I was in the pool. But one night, just as I was finishing, the neighbor woman suddenly turned the light on, both the lamp and the pool light. I was standing buck naked looking at her, scared that she would tell my parents and essentially end my life! But when she saw me, she wasn't angry, a bit curious. I apologized to her, hoping to plead with her, but she looked at me. I still had a half-erection, one of those stupid-boy looks on my face, and she said, "Do you mind if I join you?"
I couldn't believe it! Now this sounds like one of those letters in Penthouse, the made-up encounters and events that sold a lot of magazines, but it happened. Now she was not at all pretty, but she was relatively small and thin, and had a nice body. But more to the point, being the mid-70's and never been sexual with anyone else, and in fact had never seen a woman naked, this was super exciting. As soon as she took her shirt and bra off, and dropped her dress and undies, she waded nude into the pool and walked to me.
I had gone from near-apocalyptic to sheer ecstasy in less than one minute! The thought of this nude woman approaching me energized me, and when she put her hand on my shoulder I couldn't hold back. I had the most explosive and, frankly, most memorable orgasm to date. I won't get too detailed, but suffice to say that propellant wouldn't have been needed to expend my orgasm over her shoulder to the fence!
I don't remember much what was said, but she and I swam together a few more minutes, then she took me to the deep end and we ended up treading water and making out, kissing, our bodies of course fused above our kicking legs. We ended up doing it for about 20 more minutes in the pool, then she took me inside to her bed where we spent another half hour. It was past 1:30 when I finally got home, but I was so excited that I couldn't think straight the rest of the night.
The next day I went over before her shift, just making sure what happened was cool. Not only was it cool, but we made arrangements to meet twice a week where we swam, then went to her bed where she taught me sexual etiquette. The age difference never came into play, and the entire summer I learned more than I would have as an adult in ten years.
She left for Oregon by the time school started, but I will always remember that summer, and in particular that first orgasm. Even though it happened almost fifty years ago, it sears on my mind like it was just last week.