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1-8 It’s time now to take this to the ‘nature’ point of reference, and that is: what does ‘nature’ show us? What are the pattern(s) out there? And what can we learn from these pattern(s)? Remember when we first presented the etymology of the word ‘sex’ (IK3UuCoC0y & x_PzHc1eHH), and how in (1520s) the meaning association of the "quality or character of being either male or female" was first used by then in reference to ‘nature’ or the ‘natural world’; today we will dismantle this argument with reference to ‘nature’. The best piece ever written on this topic, perhaps, since Darwin’s 1871 “The descent of man and selection in relation to sex” and particularly on the topic of ‘sexual selection’ is: Evolution's Rainbow: Diversity, Gender, and Sexuality in Nature and People - by Joan Roughgarden. 
This book and the research thesis it promotes actually made biologist redefine ‘sexual selection’ from ‘sex roles’ to more generic definition without attributing any general characteristics to a ‘male’ or ‘female’. This book tackles ‘diversity’ and ‘variation’ not only in ‘nature’, but also in ‘humans’ and also in ‘human cultures’.