 One example is Jedi Master Ki-Adi-Mundi.They have a very low number of males compared to females, therefore Master Mundi was allowed to have one bond wife (Shea) and several honour wives even though he was a Jedi.Cereans sport binary brains within their large heads, and although their coordination is generally somewhat impaired relative to humans or other species, they make up for it with incredible mind control and thought processes.