Originally Posted by
Aresk
Psychology and sociology have drawn distinctions between sex and gender since the 1950s, long before any of your claimed sources such as Tumblr were around. You can pick up any 101 textbook from the latter part of the last century and find these distinctions. It's such basic common knowledge that one wouldn't even need to cite it in a research paper, because there are so many sources that simply agree to the terminology.
Also, your earlier posts seem to complete disregard the fact that intersex people exist, which while separate from the gender debate, does apply to your "only male and female" sentiments.