Many thanks to neuroparenthetical, who edited this story.

The tall, hairy, heavyset man lingered near the waterline, occasionally stepping into the shallows but rarely venturing far. His caution wasn’t due to the waves; despite the overcast sky and the breeze, the sea was calm. His reason for being at the clothes-optional beach was simple: to watch women -- that, and to hang out in the nude.

His barrel-shaped body was covered in thick hair whose color was fading from age. A small penis was tucked beneath his prominent belly. It would often be erect while he was at the beach, but its small size meant that few ever took notice. In fact, he was smaller than most men there, even when they were flaccid.

For the past hour, he’d been scanning the waterline, hoping to catch a good sight of a particular slim, young woman who, like him, stayed near the water’s edge. Like him, she was naked. Her black hair, short and neat, was held in place by a bright blue bandana headband. Her shoulders were hollow, her breasts sagging. From time to time, a male friend, also naked, would join her, but for the most part, she, like her voyeur, seemed content to loiter alone.

The heavy man mostly kept a safe distance, but every so often he took a close pass, just for the opportunity to inspect her backside and front more closely. Each time he got near, his erection stiffened and twitched. Twice, she turned and locked eyes with him. He met her gaze and kept moving.