Can big girls be sexy?

Yes.

I've always felt that sexiness (or at least, what I find attractive) was a combo of two things.

First she's gotta be confident. Not like the stuck-up, I'm-better-than-you confidence that no one really likes, but the confidence and belief in yourself where you don't need any outside validation, you just are.

Second, everyone has "their weight". Not the weight that society-at-large and the supercilious media barrage tells you, but the weight your body is naturally meant to function at. We all have a weight, but various outside influences may push us too high or too low. This "weight" is our body's natural size and is therefore it's healthiest. I personally find women who are at their "proper weight" very attractive; They are fit, but not scary-skinny.

There's a second part to that; I remember reading a study done that showed that it's not how wide or skinny a woman is that matters to men subconsciously, it's the ratio of hips-to-waist. I think it was waist should be around 70% of hips for maximum attraction. If she follows this ratio she can still turn heads, even if she is a little larger. Guys are looking for this ratio, not just a size -2.

Oh my...nothing more sexier that a woman that's thick and curvy in all the right places. I've never found a skinny girl attractive. She may have a nice or pretty face but if she's skinny...deal breaker. There are a lot of guys like me that perfer a thick "woman" versus a skinny "girl". They are just sexy...no way around it :) be proud