Why do girls like muscular guys?

Because they're a lot nicer to look at than a guy who's fat or just plain skinny..girls like guys who are strong (it's the whole, "carry me" thing).

ANSWER The same reason some like them skinny, fat, bald or hairy. It all comes down to taste and likes. Not all girls like muscular because for example, out of 10 of my friends that are girls, I'd say 8 like them look for model type guys which the majority are not muscular at all. You shouldn't generalize just because you've come across some girls that have that preference. On the contrary ask yourself why you keep on attracting or looking for girls like that. Keep on search and seeing not all are the same, I'd dare say not even the majority. Good luck.