This Spanish production (and that nation has achieved some GREAT mature-themed dramas and comedies over the past 25 years or so, going all the way back to "Tie Me Up! Tie Me Down!", etc.) traces the intermittently self-destructive search for pleasure and meaning in life of 29-year old Barcelona resident Valerie (who's actually from southern France, and some of the dialog is in French, although most is in Spanish), who, starting in a flashback (played by a different actress) at age 15, discovered that highly promiscuous -- sometimes virtually random -- sex is what she likes most in life. This poorly-thought-out philosophy brings her into some BAD situations along with all the orgasms, however: an abusive relationship with the classic too-good-to-be-true boyfriend who, as soon as they start living together, becomes a brutal, paranoid dictator...followed by her post-breakup decision to become a prostitute at a high-end brothel. By the end of the movie, she "kind of" has sorted-out her life issues...but her future is left a bit of a question mark.
The cinematography in this movie is very good, with intense colors, good lighting, and sharp focus. The lead actress (Belen Fabra) clearly has no issues with multiple fairly explicit nude scenes (including tasteful full-frontal), but these are quite appropriate to the theme of the film. I was pleasantly surprised with the acting, production and scriptwriting quality of this film, which is much better than the subtitle "Diary of a Sex Addict" (literally "Diary of a Nymphomaniac" in the Spanish) would have implied.