Hell yea! Muscular glutes/thighs on a women is an extreme turn-on, like amazing. I went out with this one chick that goes to the gym and is very fit and has an AMAZING BODY because she works out. Definitely the best intercourse I ever had was with her. Like it was seriously phenomenal. achieving a fit body with thick, muscular, beautiful legs and glutes is the best thing a girl can do to look better. Everytime I see a beautiful woman like that, it amazes me and its hard to keep it down, if you know what I mean.
P.S. YOU CANNOT just work out ur thighs and glutes tho, you'll just be awkward and unbalanced and other muscles on girls look fabulous too, even though thighs/glutes are the best. you have to do EVERYTHING: chest, back, core/abs, arms, calves, and thighs/glutes evenly, but for women, I guess you can put a little extra on the thighs/glutes, but not too much. I suggest getting a personal trainer or getting a book about working out.