I have seen the term "gender " used routinely on electrical connector packaging since my days as a lad in the '70s hanging out at Radio Shack and scouring the Lafayette catalogue.
Male, female, and hermaphrodite are biological, not grammatical categories. The word “gender” is often, too often for my taste, as a squeamish euphemism for “sex”, as in the packaging you showed, but strictly speaking, gender is a grammatical, not a biological category, assuming the states of masculine, feminine and neuter. Male, female, and hermaphroditic are never gender categories.