When Simone de Beauvoir wrote “one is not born, but rather becomes a woman,” in her pivotal 1949 work, The Second Sex, the existentialist was arguing that femininity is an idea and that gender is merely a social construct people gradually learn and adapt to fit into throughout life.

Many people have been challenging the traditional gender mind-set - fighting to push the idea that one’s view of their own gender sits on a spectrum, as opposed to on two opposing poles. Most notable of these is transgender woman, Caitlyn Jenner, who recently transitioned, and Orange is the New Black star, Ruby Rose, who refers to herself as ‘gender fluid.’

Recently, the #FreeTheNipple hashtag has fought to expose social media’s gender inconsistencies – allowing exposed male nipples in photographs, but not female ones. A backlash has recently led to women photoshopping men’s nipples over their own, to highlight what they see as absurdity of the rule, and a Free the Nipple film.

21-year-old actor, Antonio Marziale, is the latest gender campaigner working to blur the strict divides through his Instagram account @manaswoman.

Man as Woman Instagram account challenges traditional gender binaries