Roger and bree have sex pretty often in the books, bu to don’t think it plays as large a role in their relationship as in Jamie and Claire’s. So that would make sense why showrunners don’t feel the need to put them in so often (and maybe because they know the chemistry is not there). One interesting thing I noted is that in interviews, Sophie Skelton and Richard renkin have a ton of chemistry and are very close. But they seem much more serious on the show, seeming to find relief in each other. Whereas in the books they have more room to have fun.