There are no obvious nudity & explicit sex scenes shown in this movie.
In one scene, a fully clothed married couple is kissing passionately on the couch. Occasionally, the man touches the woman's fully clothed breasts. However no nudity is shown.
We see Charles's POV as he stares at Lucinda's shapely, stocking covered legs on the commuter train.
Lucinda shows a little cleavage in several scenes.
While flirting and intoxicated, Charles bets Lucinda he can kiss her without touching her. He purposefully loses, however, so that he can kiss her. We then see them outside where Charles grabs Lucinda and passionately kisses her up against a wall.
Deanne shows a little cleavage.
We see Charles in a bubble bath, but don't see anything explicit.
Winston comments that in high school there was "all the p*ssy you could imagine."
Lucinda tells Charles that "just because we didn't f*ck" doesn't mean they didn't cross the line (of impropriety)".
A hooker, who shows cleavage, propositions Charles on the road, but Charles has no interest. She says that he doesn't drink, smoke or "f*ck" and a cop who passes by (and is friendly with the hooker) seems to think Charles had other (sexual) motives. Charles then pays the hooker so that she and the cop will leave him alone (he's trying to keep them from seeing a dead body by him).
We briefly see a couple passionately make out.
Referring to Lucinda, Laroche comments to Charles about "When you just wanted to f*ck her." Laroche tells Charles that he's "going to f*ck with your life" and then asks if his daughter is still a virgin.
We see a shot of Deanne in the shower in the background of the scene. We see her bare back through the frosted glass shower door, but the view below that is blocked.