There are a few sex scenes with visible thrusting and sound effects, male/female and female/female, with breasts, chests, and butts visible. These are relatively short but emphasized as relevant to several plot lines.
Nudity includes very brief full frontal nudity of a man changing clothes and of a woman entering the ocean. Rear views are longer. Some swimwear is seen on a beach, as reported by someone else. This is clearly neither sex or nudity, but the contributor thought you ought to know.
One sex scene is implied to be painful and perhaps coerced. A spent condom is seen on the floor.
Actual and suspected infidelity plays a role in the plot.