Because I believe to have perceived a certain link between people that can be physically confident, while at the same time not having the self esteem to mock themselves. When I say someone is physically confident I mean that their good looks probably have provided them with admiration and likely also a high social status in their network. BUT, and there is quite a big but here, - surviving on looks does not secure this character's social position. They can be made to believe that they have to take themselves seriously to be admired, and that is the immediate moment when they go from stunningly sexy to boring, insecure and uninteresting.
And it is so typical, because all the quirky, fun people I know I think of as beautiful. Seeing as I know them, their outsides are reflections of their insides (not saying the quirky people I know are ugly unless you know them XD). But they are nourishing to any situation. And you always end up chatting up the most likely attractive person - which time has shown; is also the most dull.