This story is entirely true.
We are a fit couple who enjoy the outdoors, including nude beaches, with sexual play when the opportunity presents itself. She is 45, I am 51. We are professionals living in the Bay Area of Northern California.
Last year we spent a week in early October on vacation on the Central Coast in California, staying in a condo in Avila Beach near San Luis Obispo. We love this area, especially during the Fall when it is still warm, but generally not continually foggy. The area offers places to hike, bike, and kayak, as well as several very nice nearby beaches. Pismo State Beach to the south is wide and a little over 2 miles long, with dunes behind a relatively flat beach. It isn't clothing optional, but its size and the presence of the dunes can offer opportunities for erotic play. Pirate's Cove is probably the best nude beach in the area - maybe the only one. It is not too crowded in the Fall, and tends to be frequented by some of the college crowd from nearby Cal Poly.
During our visit last year we had a few interesting experiences at Pirate's Cove.
One experience that comes to mind was a brief trip to the beach late afternoon mid-week when the weather was a bit marginal. The beach was almost deserted except for a few guys up on the cliffs by the parking lot. We walked about halfway down the beach, set up our blanket, and relaxed for a while. It was chilly enough that we couldn't get naked and remain comfortable, so we just enjoyed the sights and sounds of the ocean. We were both a bit horny and had been looking forward to the possibility of some erotic fun on the beach.
As we sat there, our horniness overcame the weather and we started fondling each other. We decided that the mostly deserted beach provided too good an opportunity to pass on a quick fuck. We both removed our pants and continued to stroke each other. My cock was hard and ready to get inside my wife's dripping pussy. She got on her hands and knees facing the ocean and I positioned my stiff cock at the opening of her waiting hole. My cock slid in easily. I slowly pumped in and out, quickly bringing her to her first orgasm.