Wife getting fucked

We spent three weeks at a naturist resort in the summer and had some wonderful sex. It started when the wife was in the hot tub and was joined by a man who had wandering hands and started to finger her. She loved it. That night he came to our villa and after a couple of drinks he undressed her and fucked her. I just watched whilst having a wank. Thoroughly enjoyed it.
On another occasion we had a foursome and I watched her get fucked again. I did get to fuck his wife.
finally we met a bi couple. It was great seeing the women get it off and they loved it when he sucked my cock and I took his load in my mouth.