 "The Screwfly Solution" suggests that humans might similarly rationalize a plague of murderous sexual insanity.Sex in Tiptree's writing is frankly portrayed, a sometimes playful but more often threatening force.Before the revelation of Sheldon's identity, Tiptree was often referred to as an unusually macho male (see, e.g., Robert Silverberg's commentaries) as well as an unusually feminist science fiction writer (for a male)—particularly for "The Women Men Don't See", a story of two women who go looking for aliens to escape from male-dominated society on Earth.