I’m with @Fiddle_Playing_Creole_Bastard, as usual. To me curvy and overweight/obese are not synonymous. Just to throw in my 2 cents, I find the woman on the right the most appealing, personally.
So, I don’t think that curvy and skinny are necessarily two different things. A woman can be very slender, and still have a curvaceous measurements. A woman can also be significantly larger and still be curvy. Curvy is about shape, not so much size. Skinny is about size and not so much shape. They don’t contradict one another.
Now, as a woman, I know that many of us try to feel better about our bodies (namely our hips, butts, thighs, stomachs and breasts) by rationalizing that men are supposed to like these things. And, I believe that most men do. Individual preferences will vary, but, most men do like curves. However, if we are talking about “curvy” which has become the popular word to replace “significantly overweight”... then we are just fooling ourselves. Certainly there are plenty of people out there in the world that appreciate a more rounded figure, but if that were the norm… we wouldn’t be so worried about it. Biologically men are most attracted to a hip to waist ratio of 0.7 or less (I think, I might have to look that up)... and the more you pack on excess weight or drop excess weight, the more that ratio shrinks. Scientifically speaking, we’re all looking for a healthy mate.
Again, at the same time, it just depends on the person.