There are many sexual related comments using words like "dick", "first base/second base", being "humped" and f- words etc as well as random kissing scenes not listed below (no other sex situations and no nudity)
It is inferred that someone is having an extramarital sexual relationship with their next-door neighbor,
Earl and Pearl make out in a crowded restaurant.
Tammy aggressively kisses Bobby near a public restroom and asks if he wants to have sex.
Pearl and Earl kiss in the backseat of a car. We briefly see a lot of kissing, Sex is then implied.
Earl and Pearl have offscreen sex in a motel room.
Pearl gets very drunk at Lenore's 4th of July party and flashes her breasts at dozens of partygoers from the stage. The scene is partially obscured by an object in the foreground so we see no actual nudity. We learn that Earl has posted photos of Pearl flashing her bare breasts at Lenore's party.