Some episodes contain more mature content than others, including discussions about sexual activity and violent events like abuse and mass suicides. There's some cursing, and drugs use is sometimes a topic of discussion.
Why is you Rated MA?
The series is rated TV-MA for a good reason.
To start, there's a lot of language that isn't bleeped out, including f-bombs, and there are several sexual scenes, though there's no full nudity.
Why is disclosure rated MA?
Powerful drama has mature sexual themes, violence.