It is a big turn on to see guys watching her or finding an excuse to come up to her and chat if she is wearing a sexy bikini, especially if it is a thong or gstring bikini.
We did Carnival Miracle years ago and were surprised they had a 'topless' deck. This more than topless. Big sign said "NO CAMERAS" today smart phones makes that obsolete.
I love when my wife puts on this bikini, and sometime she gets in high heels so her butt pops out. It turns me on to see other guys watching her and looking at her nipples when they get hard after swimming 😉