multisexual

multi- +‎ sexual, by analogy with bisexual.

multisexual (not comparable)

1. Of, or pertaining to, more than one sex.
2. (neologism) Sexually attracted to more than one sex or gender.
   • 2014, Sian Ferguson, "Bisexuality 101: Bisexual Visibility Week", Women24, 23 September 2014

     'Bisexual' is a broad term. People who fall under the bisexual umbrella might have more specific identity labels, such as fluid, multisexual, non-monosexual, pansexual, polysexual, pomosexual, and omnisexual. People might use both ‘bisexual’ and a more specific label, or just one of the two.

multisexual (plural multisexuals)

1. (neologism) Someone who is sexually attracted to more than one sex or gender.

• multisexuality

• plurisexual
• polysexual