There is no nudity in the film, and most of the sexual activity is off-camera, except for one brief bed scene - that is along the lines of what one might see on TV. However, the theme of the movie involves a married woman sleeping with a man (actually two men), in hopes of getting pregnant - with her husband's reluctant permission. As such, there is somewhat frank talk about sexual matters, although little is shown.
Catholics (and others) might well be offended by the plot, which involves a priest falling in love with, and sleeping with, a married woman, thus breaking his vows of celibacy (and committing the sin of adultery).