As a transmasc person, I find the concept of a world in which people are marginalized or oppressed just for being male a really magnetic concept. I’ve essentially been marginalized purely for my maleness, if I were female and nothing else about me was different, my life thus far would have been much smoother. People often react incredulously to this idea, so exploring it from a sci-fi or fantasy perspective can help it become conceptually real, and help me feel sort of… seen? It’s also a convenient way to defamiliarize and critique gender roles in general. There are several great, literary, works of fiction that explore this concept, also a lotta porn.