Three senior men wear swimming trunks. No nudity, no sex.
A man joins his wife in the shower. He is shown from the chest up, and she is not shown at all, but we hear giggles.
A man lying in a single bed opens the covers and pats the bed suggestively to his wife encouraging her to get in with him. She obliges, and the couple are seen cuddling.
Three married woman are seated around a table giggling and acting dreamy. It is implied that they all had sex the night before, but the implication would be lost on younger viewers.
A man peeping through a small hole spy's on a woman getting undressed. We (and presumably he) see her bare back only.
A woman is shown from behind fully naked as she walks down steps into a pool. Her backside is clearly shown (if not more). A presumably nude man is waiting for her in the water.
It is implied that an elderly man cheats on his devoted wife. It is later revealed that he is a habitual cheater.