Their is an "it factor" that is extremely difficult to quantify. It goes beyond beauty, it goes beyond the size of their rack, it goes beyond the proportions of their figure. It even goes beyond the willingness to act sexy or get nude. Their is a reason even people's grandmother's know who Sydney Sweeney is and other celebs who are also beautiful, also sexy, and also show skin, are not being talked about nearly as much. I find Sydney Sweeney sexually attractive, physically beautiful, etc, but her level of "hotness" goes way beyond her already appealing physical beauty. I'm pretty sure I can think of some women that I find more beautiful than Sydney, yet are not as desirable to me. Sometimes it's not easily definable.