There are a ton of discussions about sex throughout the series.
At the beginning of the first episode, viewers hear Georgia explain that "you better make sure you're getting something [else out of sex] or you're just getting screwed" while describing sex. To Georgia, it's clear that sex can be a tool used to manipulate men. Additionally, there are several scenes that involve masturbation — the most colorful one includes an electric toothbrush — and Ginny and her friends chat about sex often.
While Georgia has a progressive outlook on sex and encourages her daughter to come to her with questions or concerns — she even puts Ginny on birth control at one point — this could be a good way to begin talking about safe sex and pregnancy prevention with your teen.