Rather than a definition or redefinition of masculinity, or masculinities, this article asks what can masculinities do? To explore this question, I map the possibilities that Deleuze and Guattari’s philosophy of immanence offer masculinities theory. Through a theoretical encounter with Deleuze, Guattari, Spinoza, and Gatens, I seek to open up an alternative conceptualization of masculinities that moves away from morality—transcendent judgments of good or bad—and toward an ethics that privileges our capacities for affecting and being affected. While masculinities studies and gender theory has proposed related notions concerning gender fluidity and resisting gender binaries, this article proposes an alternative through Deleuze’s and Gatens’ readings of Spinoza’s Ethics that radically challenges the mind–body split that informs traditional lineages of Western philosophy. What is at stake for this essay is the ability to conceive of masculinities as creative force with no allegiance to the male body other than its capacity to affect or be affected.