I & many of my friends when we were in our 20s shared subscriptions to playgirl so I am not an anomaly. There are countless forms of gender relationships in animals.  As another poster put up, we are related to chimps & bobolo chimps, these monkeys are our closest relatives-yet these monkeys have opposite ways of living.
Bobolo chimps are ruled by the females & solve every disagreement with sex & celebrate every good event with sex.  They have sex all the time & more than most other animals overall, but have no rapes, or infanticides & are quite peaceful.  
Chimpanzees however are run by males & use violence to get sex, often rape, kill infant chimps & males kill each other over male hierarchy status.  
Both are equally close to human's genome but when females run things everyone (including the males) gets more sex, has more peace and is happier.  When males run things, everyone gets less sex, there is sexual violence & no peace or unity but much division. Sounds like the RC hierarchy!