It doesn't but what women bulks up in muscles?
Not many, but I will say a friend of mine who's about the same height as me (5'7') was 160 pounds a couple of years back and she had a pretty damn good body. Although, she could no doubt crush me with her legs. But she's not a normal case, as she runs track in college.
160 at 5'7" is definitely chubby, but I might have to side with Himuro and say it's not "fucking fat" but maybe I'll just a nice guy. Now... 160 at 5'3" is fucking fat.