I can answer this one for you. When I'm on holiday and some chick is laying there topless, I have a quick look. You can say I'm a creep, but most guys do it even if they won't admit to it, same way I sometimes have a quick look in the wing mirror if an attractive woman with leggings on or a short skirt walks past my car, or if there is a hottie in the gym on the squat rack. I'm just honest, most guys do it, not stare like a predator, just a quick glance and think "Hmm, I'd hit that".
So if I was in that pool, I'd definitely be staring at Tiffany's tits as much as I could away with it, and why not give people the option to stare at the others if they prefer Taylor or Sophie? Or you can stare at Vanessa if you want to be nice and loyal?