A dog skull on a stake: the manliest science fiction movies of all time

Not to put too fine a point on it, but science fiction has never been what you would describe as the manliest of genres. It tends to have people dressed in funny and non-manly ways (check out Sean Connery wearing a Red Diaper in Zardoz if you don't believe me), involve extended nerdiness, and advocate social positions which are the antithesis of mainstream male-ness in early 21st century America.