The sheer animal force of antagonist Stanley Kowalski is partly responsible for the fame of A Streetcar Named Desire. In this play, masculinity means aggression, control, physical dominance, and even violence. Accompanying these traits are a general lack of refinement, manners, and sensitivity. One point of view expressed in the play is that this sort of brute masculinity is primitive and sub-human; another is that it is attractive and sexually appealing.
The conflict between Blanche and Stanley boils down to different ideals of masculinity.