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"unisex" (of clothing), also "bisexual," 1938 (ambisexuality is recorded from 1924), from ambi- + sexual. As a humorous coinage based on ambidextrous, ambisextrous is recorded from 1929.
ambisexual am·bi·sex·u·al (ām'bĭ-sěk'shōō-əl)adj. Sexually attracted to either sex indiscriminately. n. An ambisexual person or organism.