Guys and girls- opinions on weight?

i was wondering what guys really tought about a girls size, theres always going to be those hott girls that are born gentically skinny and saty that way and yes they can be gorgous too. but when a guy is with his girlfrind whos mabye thinker or not as pretty or has flaws does he think about how he`d rather have the hott girl? i personally think all girls can be and are beautiful in any shape or size. what do you think?