sex (http://rs.tdwg.org/dwc/terms/sex) @return [String] The sex (gender) of the taxon for which the vernacular name applies when the vernacular name is limited to a specific gender of a species. If not limited sex should be empty. For example the vernacular name "Buck" applies to the "Male" gender of the species, Odocoileus virginianus. Vocabulary: http://rs.gbif.org/vocabulary/gbif/sex.xml Example: “male”