"Harmony bondage" is more than just a recognizable brand name; it's a slang term among the S/M crowd for a certain style of ultra-light titillating bondage, where the girls end up topless (at best) and any moments of humiliation or discomfort turn out to be "all in good fun." This stuff's for bondage enthusiasts who don't want to be considered perverts, much less part of the raincoat crowd.
Which is not to say that it doesn't have charm or appeal at moments. In this case, it's the closing scenario, "The Toothache," between Ander Page and Amber Michaels. One roommate has a toothache and no insurance; the other once played a dental assistant on TV. Cue a gag made with dental cotton. Our cute little actress calls a real dentist for advice, scores a date and runs off to meet him, leaving her roommate still tied up. The rest, especially the progression of familiar-looking ties, is a little formulaic.