Just my opinion, but I think you may scare off newer and younger dancers with a course title/subject like this. It's hard enough to get newbies on the dance floor without making them think they're tackling something as big as a serious relationship. Newbies just need to get out there and get going on some basics for starters. (A casual mention that dance relationships can be tough/complicated, just like off the floor relationships, could be helpful if they are struggling with that - e.g. for a romantic couple taking dance lessons together.)
Give the Sissies book a read - and then think about what dancers would be a good audience for that book. That's probably your target audience for a class with this subject.