Leisure studies have given scant regard to human-animal relations and intersectionality. In this paper, I respond to calls for research analysing leisure as a complex, multispecies phenomenon by exploring humanhorse relations and intersectionality in boy's/men's equestrian stories through the concept of intra-activity and creative analytical writing. Thinking and writing through intra-activity brings insights into the coconstitution of humans and horses, as well as the entanglement of other power relations and social categories. The paper illustrates that becoming horseboy(s) is a process of material-discursive intra-activity where boys/ men, by transcending the human-animal divide simultaneously transcend the female-male/masculine-feminine divide. Thus, engaging materially with horses can allow and encourage boys/men to be less constrained by dominant gender discourses. The paper also illustrates the importance of studying gender, not as a separate or primary category of privilege or inequality, but as one that is entangled with race, class, sexuality, age and other animals. I finally argue that bringing horses, as well as discourses, into discussions of the enactment of gender in leisure landscapes offers a productive site for elaborating the much-debated question, posed by feminist posthumanists, of the agency of matter.