Tell me, when you find someone attractive, are you finding him attractive because of one or two specific attributes, or because you find the entire person attractive?
I've never once thought to myself "I fancy the pants off her because of her breasts". The thought stops itself at "I fancy the pants off her".
Despite how shallow men can be, we're really don't treat women like they're a mix and match set of parts, and we're looking for the one with all of the physical attributes we most want. That's not how it works. It's a binary choice. We either fancy the person or we don't, and that choice doesn't come down to any specific attribute. We're not thinking "I'd fancy her if she had red hair", or bigger boobs, or a nicer laugh. We're attracted to someone because we like the person - looks, personality, confidence, all rolled into one. Yes, individual attributes may contribute to that, but it's the whole that matters.
I'm gonna go for a food based metaphor now. I like pizza. But I like pizza because its a combination of different ingredients. I'm not going to sit there and eat a plain pizza base, or squirt tomato sauce in my mouth, or eat a block of cheese. (Well, ok, maybe the last one)
Now certain ingredients in pizza are vital. You can't make a pizza without the base. And certain ingredients are highly recommended, like tomato sauce and cheese (Any BBQ sauce lovers can shut up right now, you're sick freaks and you know it.) Everything else is just a topping, its optional.
For me, and 99% of people, the base is pretty simple - Opposite sex, within 10 years of me. Conscious.
Tomato and cheese - Good company, not a racist, intelligent etc.
Toppings - Literally everything else
You're treating "big boobs" like it's the pizza base. Like you literally cannot make the pizza without it. It's not. It's a topping. And not a particularly important one either. It's pineapple. Some people love it on a pizza, some people can't stand it.
Now I don't mind pineapple on a pizza, but that doesn't mean I want a Hawaiian every single time. Personally, I'd usually go for something else.
And yes, there are men out there who only want a plain cheese pizza with some pineapple added on top. But mostly, they're very boring men whose opinion on pizza isn't very important.
Most men like a wide variety of pizzas, some might have pineapple on them, most won't. And for most men, the individual ingredients are less important than the fact that the pizza as a whole tastes nice. And when we're eating a nice pizza, we're really not thinking "I wish this had some pineapple on it." We knew when we bought the pizza that it didn't have pineapple on it. We made that choice intentionally, because pineapple isn't important to us.
Right, I've tortured this metaphor enough I think.