Douglas Harper's Etymology Dictionary
Wiktionary
omnisexual
a. pansexual.
Usage examples of "omnisexual".
Most are womanly in shape, some are androgynous, some are homo-, bi-, or omnisexual, and a few take other forms.
I don’t mean to say that he was epicene in the sense of being sexless, but rather that he was androgynous, omnisexual, capable of finding and giving pleasure with anyone or anything.