The American Heritage® Dictionary of the English Language, 4th Edition
adj. Having a sexual orientation to persons of either sex; bisexual.
adj. Suited to either sex; unisex: "The patterns also are available for men because [the designer] believes in ambisexual fashion” ( Women's Wear Daily).
adj. Bisexual: attracted to persons of either sex.
adj. Unisex: fit for persons of either sex.
adj. Of ambiguous sexual orientation.
n. An ambisexual person.
Word Usage
"Quetzal has never been to the States, but he spent time in Montreal studying fashion design and living as a “hippie” in what he describes as an ambisexual, drug-addled three-way relationship “No es el sexo, es la persona”."