This happened quite a few years ago. My wife and I had just started swinging a couple of years before. Most of our experience was with a private group, no real random people.
At one party, someone floated the idea of renting a beach house, four couples pitched in and made plans. Unfortunately one of the couples had to back out.
We arrive at the house, unloaded and started setting things up, it was already dusk, but the girls changed into bikinis and headed for the water. Down the beach we saw a decent sized group of people that ended up being from nearby college.
Now my wife was tall, 5’10+, waist length black hair, green eyes and was curvy before our daughter was born but after , her tits grew huge, her hips went from barely there to thicc as hell, she was athletic so her waist and stomach was still tight.
Wife 2, was the total opposite, tiny, petite, but still cute as hell and wife 3 was a BBW (Barbie Ferriera type body) but still hot.