I think that all kind of braces are sexy.
Retainer is so cute on woman, I love the lisp and the sound of mouth, and i love the games that you can do with her retainer
Fixed is top, with powerchain and elastics on top and bottom
But all kind of appliance (expander, tongue crib, herbst) are interesting but i never meet a woman with these braces
Headgear, best the neckgear, is my dream.
I know that in adult woman is very difficult to find these kind of appliance... I hope to find a woman that wants to wear this for fun