This question is to the guys. I know a lot of girls, personally and through Internet, that wish their thighs were smaller. Personally, I think that skinny thighs in a normal weight woman is very ugly, and I, being skinny, want my own thighs to be bigger. I think boys agree that bigger thighs are better but I'm not sure. If you are not sure how each one looks like just google "skinny thighs" and "thick thighs". I cannot include links her sadly.
I think a nice pair of toned thick (er ish) legs is soooooo sexy. Like if they are in track or run, and you can tell because their legs are just in such good shape. I don't like freakishly muscular thighs though, and I don't mind thinner thighs, they -like I said earlier- have to be healthy looking though.
I think it depends what you mean by thick and skinny. And men have all different standards. Some like big thighs, some like small ones. And skinny thighs does not equal thigh gap nor does thick thighs equal no thigh gap. I have thighs that are on the "thick side" and I have a thigh gap because I have wide hips. There is good thick like this: which comes with good shape and a nice ass. 4.bp.blogspot.com/.../fit1.jpg There is "thick" as a lot women try to spin it: which is generally very shapeless and just large alyasfitclub.files.wordpress.com/2010/11/wl6.jpg
I think that a large percentage of men will prefer something a little smaller than the first, or something in between the two, like a regular size. Other men like the very thin ones. What it boils down to is what you are comfortable with and how YOU want to look. Don't worry so much about what guys think because everyone has different preferences and you will never be content.
If you want bigger thighs, try to build some muscle. Squats, deadlifts, lunges, leg press, split squats, glute bridges...
Just do you and be confident and you will be fine.
I think it's more about the shape. If a girl has thick, fit legs it's sexy. And if a girl has lean, VS legs, it's also attractive. But scrawny skeletal legs and legs that look like meat rolls aren't going to be preferred by many guys (or girls).