What about moderation? You make it sound like if you enjoy a cheeseburger every now and then, you can never have a "sexy beach bod". You don't have to eat like a bird to look good in a bikini. That's a false dichotomy.
How about a girl who doesn't obsess over what she eats? Someone who likes to eat good nourishing to her heart's content AND splurge on a burger or pizza once in a while. How about a girl who doesn't spend her life in the gym but stays active enough to achieve health and balance by having hobbies and fun things that keep her busy? How about a girl who isn't skinny or fat but soft and sensual and well proportioned?
Honestly this is an obvious question. It's not like we only go for the hottest ones, but if you're given the option, wouldn't you choose the better one? I know some people actually do prefer the other option though.