can you name this story?

[fredafraid]

I remember reading a cuckold theme story, it was in many parts (I think), there was a scene where the couple were at a pool and the wife was invited into a cabana to be with another man. the husband was 'distracted' by his friends, sitting with him poolside. He was then sent back to the cabana with a drink for his wife, in time to see her with her 'bull'. later in the same story he went to a night club and was able to watch his wife and the same man. I just cant remember the story name, and/or author.
I know I am not giving a lot of info, but if you know the story please help. thanks