Teen girls kissing one another on the mouths in multiple episodes, undoing one another's pants
Teens encouraged to have sex by adults. No nudity. Reference to first time (ripped pants off man). One character invites another to watch.
Many people have sex including threesomes. Some people are naked, but you don't see any nudity.
One character is the product of a polyamorous relationship involving several men and one woman.
Non-graphic discussion of romance and sex, including the magical power provided by sex, often occurs. A recurring plot line involves a controlled breeding program where witches are put in arranged marriages for the purpose of creating new and powerful witches rather than marrying for love.
A man draws a picture of his genitals and sends it as a love note of sorts to the girl he is courting. We don't see what is on the paper at all. Her roommate sees from behind and says, "There's no way he's that big." This is in episode 4.
A dead man is shown in a medical room. At first, he is assumed to be naked, but a sheet covers him from the chest down. All we see are his shoulders and his head. Later he is shown again, this time fully nude except a thin loincloth to cover his genitals.
A lesbian couple is shown in nearly every episode kissing or engaging in some sort of sexual act, but it's never too explicit.
Lots of naked people making out and implied sex in episode 4. No actual genitals shown but it still is pretty graphic. The kissing noises and moaning and stuff continue in cut scenes later in the episode.
A man and a woman have sex.