There is a scene where a woman is in the bathtub. She is naked but you can't see any of her private parts.
There is no nudity in this movie.
Some sexual sounding moans from the neighbours can be heard
a man hugs and kisses his wife
Some sexual innuendo and a few heterosexual kisses; in one scene a husband nuzzles his wife's neck and cheek.
A woman spreads her legs suggestively in front of her husband (her skirt hangs between her bare legs), licks his chin, kisses him so passionately she bites his lip, pushes him onto a desk, rips open his shirt, unbuckles his belt, kisses him roughly again, and then kisses down his chest before he pushes her off.
A woman wearing a cleavage-revealing nightgown gets into bed with her shirtless husband; they talk, she caresses his chest, they kiss passionately, they hear a female neighbor moaning (she's obviously having intercourse), and then they presumably have intercourse (the scene ends before we see anything).
Twice, we see a woman's bare shoulders, arms and upper chest (her breasts aren't visible) when she's in a bath tub; also, we see a shirtless man and a woman wearing a nightgown.