There was a great letter in The Sun a few years back which really turned me on. A married couple had gone abroad on holiday. Whilst sunbathing on the beach, they got chatting to two young British lads. They had admired the wife in her bikini, but she amazed her husband by taking off her top for the first time ever right in front of the lads. Later, the lads were invited back to the couples' hotel room for takes and all three fucked her. The husband wrote that whilst he was happy to keep this as a holiday fling, she was keen to carry on where they'd left off when they got home.
I related the story to my wife later. She liked it and knew it had excited me. Sadly though, I have never been able to persuade her to go topless on a beach. I'd love lots of passing men to be able to see my wife's bare breasts out in the sun - something like this :
Peter C