Definition of sexualist in US English:

sexualist

noun

historical
  • A botanist who accepts the theory that plants possess sexual organs; specifically one who accepts or advocates the sexual system of classification proposed by Linnaeus.

Origin

Late 18th century; earliest use found in William Smellie (1740–1795), printer, editor, and author. From scientific Latin sexualista from post-classical Latin sexualis + -ista.