James Bond is the ultimate masculine figure
Bond is an Alpha male - a symbol of everything a man should be.
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Bond embodies all aspects of masculinity that men aspire to. He is protective, confident and charming. The way he holds himself, the way he charms women and the lifestyle he lives are all indicative of a strong, masculine presence the average man should aspire to. This is a huge part of his appeal to audiences. This speaks to why Bond has always been and should always be a man, something that has been corroborated by one of the producers of the franchise. The way masculinity underpins Bond's very essence means that Bond should be played by a man.
[P1] James Bond is the epitome of masculinity. [P2] This is what makes him an aspirational figure and a popular character.