They are non-binary, frequently changing form and gender to adapt to the target of their seduction.
Succubi / Incubi are lusty and seductive creatures who ultimately aim to slay mortals and take their souls. They accomplish this by using their shape changing powers to assume a form most humanoids find stunningly attractive. They are cunning linguists, and frequently charm their victims.
Typically, the female-presenting form is called a Succubus (pl: Succubi) and the male-presenting form is called an Incubus (pl: Incubi), with Concubus (pl: Concubi) sometimes used as a gender-neutral term.
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Succubus on the Forgotten Realms Wiki