Wiktionary
mixed-sex
a. Comprised of both males and females.
Usage examples of "mixed-sex".
As the S&M was a secret society, all its members flatly denied its existence and refused to verify the rumors that the mourning ceremonies would climax with mixed-sex war-painted naked dancing and skinny-dipping on a private Vineyard beach, at which time candidates for the vacancies in the big guys’ beds would be intimately auditioned.