Innuendos scattered throughout.
In an early episode, Bay and her boyfriend make out on top of each other. They stop before anything further happens because he "doesn't have anything."
Teens sleep with each other in many implied scenes. Characters cheat on one another.
Daphne (as a minor) gets involved with an older coworker and it is implied that they sleep together. This is portrayed negatively.
A boy cheats on his girlfriend. This is shown for several seconds, though not explicit, and repeated in flashbacks.
A main character loses her virginity. This is discussed in many conversations.
A young engaged couple who is waiting until marriage to have sex is encouraged by a parent to do it and see if they still want to get married. They take her advice and are shown in bed together the next morning.
Katherine beings writing steamy books based on stories she's heard through her husband's previous job as a baseball star.
A character takes the morning after pill after forgetting to use protection, and this is discussed in several conversations.
Adults are shown in bed together.