For one of the better older man, younger girl movies that was banned from the U.S. for several years try Chloe with Marion Cotillard. She is depicted as a 15 year old prostitute and there are a few nude scenes of her. I saw the uncut version on Netflix and Amazon Prime has what they advertise as the uncut version but it is the R rated version. It also isn't available through Amazon in either version as far as I know.

The Diary of a Teenage Girl (2015)
The story of a 15-year-old girl that has just started an affair with her mother's boyfriend in 1970's San Francisco".
From the official synopsis: Like most teenage girls, Minnie Goetze (Bel Powley) is longing for love, acceptance and a sense of purpose in the world. Minnie begins a complex love affair with her mothers boyfriend, the handsomest man in the world, Monroe Rutherford (Alexander Skarsgrd). What follows is a sharp, funny and provocative account of one girls sexual and artistic awakening, without judgment.
It has good reviews and Alexander Skarsgard.

Breathe in (2013)
That movie is gorgeous so you should love it, and Guy Pearce is dreamy.

Beau-pre (1981)
(as someone else mentioned)
Une vraie jeune fille (1976)

• aka A Real Young Girl
  Laura, les ombres de l't (1979)
• aka Laura
  La petite voleuse (1988)
• aka The Little Thief
  Piccole labbra (1978)
  L'immoralit (1978)
  L'amant (1992)
• aka The Lover (as someone else mentioned)
  Pretty Baby (1978)
  Premiers dsirs (1983)
  OCJOC

Check out:
The World of Henry Orient (1964)

Trees Lounge (1996), the relationship between Steve Buscemi and Chloe Sevigny's characters.

Almost every one of these films plus hundreds more are listed and recommended in the More Films with an Older Man Younger Woman thread.

Pretty Poison - somewhat obscure, but it's a great 60's movie that doesn't seem a dated at all
Ghost World - surprised nobody mentioned it so far

Poison Ivy
(1992) with Drew Barrymore. Surprised nobody has mentioned it.

Have you ever heard of the French? They make tons of movies like this: "Claire's Knee" (which someone mentioned), "One Wild Moment" (re-made in the US as "Blame It on Rio"), "White Wedding", "Beau Pere", "Savage Camp", "36 Fillette", "Stay the Way You Are" (actually that one's Italian) and most of the films of photographer/director/pervert David Hamilton.
Actually, THIS film was made with French money and the original book was first published in France. Oh yeah, Roman Polanski is hiding there too. . .

Baby Doll (1956)
Le genou de Claire (Claire's Knee) (1970)
Manhattan (1979)
American Beauty (1999)
Hard Candy (2005)

Luis Bunuel made a movie in the 50's called The Young One (La Joven) it deals with the subtle relationship between a willful young girl and her relation. A black jazz musician comes in and out of the story also. Worth a look.

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I don't think any of these movies have girls as young as Lo, but that's probably a good thing. Here are some good ones:
The Lover
Down in the Valley
White Oleander
Amy and Isabelle
Somersault
An Education
Ripe
The Quiet
The King
"Why is it that every time I need to get somewhere I get waylaid by jackassery?"

ok but are you a pervy 32 yr old woman?

Leon: The professional
Such a great film
http://www.imdb.com/board/10110413/?ref_=sr_1

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If you will scroll down to the "More Films with an Older Man/Younger Woman Theme" you will find hundreds of films of all genres and eras and each and every one of them center around a relationship between an older man and a younger woman. No, they are not all taboo relationships- in fact, most are not but there are enough that are to keep you happy for quite a while.
My favorite of all of them is the Polish film "Sara" and is the first one listed. Check it out- I think it will fit what you are looking for. You can easily get a copy from amazon. And no, I'm not a pervy old man either- I'm female as well, though I'm older than you by a few years.