Morgan tends to wear very thin clothing most of the time. Even when her clothing isn't thin, she still tends to show cleavage.
Arthur is seen with a woman, both naked. Buttocks are seen, but no other genitalia. The woman's breasts are seen briefly.
Arthur has a dream of a woman, completely naked. At first, she's blurred, but then becomes sharper. Even when blurred, it's obvious she fully nude. The woman turns out to be Guinivere.
Morgan has sex with a man, somewhat clothed, but still very much naked.
Arthur's brother mentions that he knows where Arthur's secret hiding place where he brings other women to.
During a ritual, Morgan takes off her one-piece outfit and is nude. Nothing below the waist is seen, but her breasts are visible.
A man Morgan had sex with publicly threatens to rape her only to be stopped. No nudity shown, just implied through camerawork.
Arthur has a dream where he has sex with Guinivere. Brief. Breasts seen momentarily, but no other nudity shown.
Arthur and Guinivere have sex on a beach, only as explicit as in his dreams.
Guinivere and her husband have sex, but no nudity is shown, just some thrusting and heavy breathing.
A shirt Guinivere wears doesn't reveal much cleavage, but shows some of the sides of her breasts.
During a feast, a group of seven women dance around the feast table wearing only pants and a single strip for shirts, letting their breasts come in full view. Later, some of the women are shown having sex with a few knights after the feast. Butts and breasts are present, nothing else is seen.
While in a transformed spell and looking like Igraine, Morgan has sex with Merlin. Some nudity is shown, primarily Igraine's breasts, but little else. Some thrusting is shown as well.
In the last episode, Guinevere and Arthur have one last sex scene together. Immediately afterward, it is revealed that it was not Guinevere, but Morgan he had sex with.