I've tried for years to convince my wife to go topless but she's too self conscious given the size of her boobs (double G cup). As posted elsewhere on here, we took a couples holiday a few years ago and her friend was topless the entire time, like from the min we landed! Whilst much smaller than my wife's, she has amazing perky tits and caught me staring on more than one occasion. I DID manage to convince my wife to flash her friend's husband after a drunken night so she pulled her top down and allowed him (and the rest of us) to stare at her tits for 1 min. He told me the next day he had wanked off thinking about it shortly after....
Now, we holiday with the kids so there is no chance of a repeat....although me and him have swapped some photos over the years unbeknown to the girls