As a “B Squad” of gay athletes tries to overcome inexperience and push past rivalries to score an elusive win, a secret affair simmers among them. This British drama is a deep dive into rugby—half macho battlefield, half tender brotherhood—but don’t sweat the rules (or “laws,” which even the sport’s fans find impenetrable): the real drama occurs off the field as infidelities, heartbreak, and unimpeded passions rule the day.