When it comes to my characterization, I'll have to admit I'm a huge culprit of not putting much detail into my characters. It took me several years before I finally found the balance I like. I don't want to have to define every inch of my characters. (Besides, who's to say what I think is every woman's version of sexy?) I try to define a few distinguished features like eyes, hair, broadness of shoulders (on a man) and basic body type for a woman, (buxom, willowy or slender) but then I leave the rest up to readers imagination. I do occasionally add a scar or tat that I might describe but other than that, it's all up to the reader. The reader has a brain and I want them to fill in what they think is the sexy - lots of body hair...or clean shaven...it's up to them. :D
And don't forget to check out all the other author's views on characterization! They can be found here.