As a 20 year-old man, I must admit that I found the first love/sex scene in the film, while not truly explicit, to be exceptionally gritty; there is no nudity, but the few shots of implied oral sex during the characters dialogue stood out as being far more sexual than the other 2 brief sexual scenes, almost shockingly so. The way it was presented- with the gritty, sensual lighting, the movement of the woman's head towards the mans waist, coupled with the recognizable sounds of oral sex- felt out of place, and I feel that the movie as a whole would have prospered if just those few seconds had been cut from the final film.
(Other sexual content)
Aside from that first scene, there is also a very brief shot of a man and a women having sex under a bed sheet, showing only the man's back, and another slightly-comedic scene in which a character is caught with a prostitute, which contains a few frames of his partially-exposed rear-end. Nothing overly explicit, but these scenes are a central aspect the the plot, and they should be noted.
Needless sexuality aside, the film is highly engaging, with powerful and complex dialogue throughout, fantastic performances by all actors, and tremendous costumes and sets. Very unique on all fronts.
Due to the sexual nature of the film, as well is it's inherent complexity in both dialogue and plot, this is not a children's film in any way, and I would place it in the higher (R) end of the PG-13 spectrum. However, it's worth watching if the audience has substantial maturity.