S1, A man and woman make out on a kitchen table. No nudity but passionate kissing and thrusting is shown.
S1, A man and woman have sex in a hotel, it is very brief and does not have nudity.
S1, A man has sex with a woman wearing a bra in a missionary position, thrusting & moaning is shown. This scene lasts about 15 seconds.
S1, a man and woman are passionate and remove clothes in a hurry to have sex. The scene is cut when they are about to make out.
S1, In a brief scene a man picks a woman and makes her sit on a balcony window, while kissing and removing her clothes. Her bare back and side of her breasts can be seen.
S1, There are several scenes where men appear nude and their rear exposed sometimes but they are in a non sexual way.
S2, Two men kiss vigorously many times throughout the series.
S2, A man and woman have sex, with the woman sitting on top of the man trusting and moaning. Though they are nude, nothing is revealed. The scene lasts about 10 seconds.
S3, A man and woman have sex, with the woman sitting on top of the man. The side portion of her breasts are clearly visible and there is lot thrusting too. Afterwards the woman stands wearing a tight and revealing underwear. The scene last for 15-20 seconds.
S3, There are multiple scenes of men kissing each other vigorously, sex is implied.
S3, After kissing passionately, a woman sits on man and takes off her top as the man puts her hands on them her bare back is seen. There is also a scene where a woman stands in a revealing bra.
We never see any actual nudity and most of it is very brief lasting 5-10 seconds max. Most we see is thrusting from a distance.