Probably not the best, but the first public sex scene my wife and I have seen was very impressive.
We were at CRC, a couples only, clothing optional small resort near Cancun; it was March 2003. While we took some drinks at the bar, beside the pool, there was a very attractive couple close to us laying at chaise lounges. He had his dick erect. Suddenly, the girl stood up, rode him in "69" position and started giving him a BJ while she showed her bald pussy to the world less than 8 ft from us. Soon the husband was licking her like he was starving. An older couple approached, said something that we couldn't hear/understand and the girl changed position kneeling between her husband's legs and continued blowing him. The second girl rode on the first guy offering her pussy to him and the second guy fucked the beautiful first chick from behind. It was a great foursome for our first day we’ve stayed at that wonderful resort wich is now, unfortunately, closed.
We were very impressed and very horny at the same time. That night after dinner, we had some wild sex and decided we were gonna let loose a bit. This public nude pic is of me near our home town and our first adventure with this sort of public disply. - Janet & Dick