The missus and I finally watched "Below Her Mouth." Some friends described it as an erotic movie with a real plot and real acting, etc. Well, those friends don't know a plot or acting from their a$$es. The women are gorgeous, the sex is well done, believable (even highly explicit, more akin to high-brow porn), and filmed beautifully. The rest of the movie is a crap filled train wreck.
If you're looking for a "mainstream" porn movie, then it fits the bill. If you're actually looking for a story of love between two women, then see the movie "Carol" with Kate Blanchette and Rooney Mara, which is a fantastic film with a great script and terrific acting.