I don't frequently use a sex-based gender system in my a priori conlangs, most of my a priori conlangs don't have genders or have an animacy-based noun class system.
For example, Lonmai Luna, an a priori conlang of mine, doesn't have grammatical gender or other types of noun classes. Lonmai Luna is originally spoken by long-longs, long-longs are a kind of Oviparous animal, they are intelligent being, but they don't have sexual dimorphism, long-longs can perform parthenogenesis and change their gender between male, female and undediced by their will, most long-longs keep their genders undecided in most of the time, and most long-longs give birth to their offsprings by parthenogenesis, having sex is uncommon among long-longs and Lonmai Luna has no native terms to describe sex or gender.
To compensate the loneliness of parthenogenesis in taking care of children, long-longs who are relatives to each other frequently live together and take care of the offsprings of each other, which leads a hawaiian kinship system of Lonmai Luna, and as a result of lacking of native gender terms and the use of a hawaiian kinship system, Lonmai Luna has a very simple and gender-neutral kinship term in its native vocabulary.
However, as long-longs are peace-loving intellectual beings, they have a quite developed culture, and after human beings entering the 8th world, the world originally lived by long-longs, some human beings adopted Lonmai Luna, as Lonmai Luna is usable by human beings, and human beings started to bring gender terms and sex terms into Lonmai Luna from their native tongues.
Also, the life cycle of long-longs can be read in the following links:http://k1234567890y.deviantart.com/art/ ... -440050088
(English version)http://k1234567890y.deviantart.com/art/ ... -440050284
(Lonmai Luna Romanization version)
True devils can truly hate devils, hating evilness is not the same to not being evil.