Great question!
While there are opportunities for other male characters to be involved, it largely depends on YOU. For example, in Deku's storyline, you will have the agency to decide his path: you can choose to stand your ground and defend your relationships (Pure/Chad route), or let things slide down a darker path (NTR/Cuck route) if you prefer.
So to answer you: It's not forced. You shape the story based on your decisions!