The Big Bang Theory
This CBS sitcom ran for 12 seasons (2007–2019) and follows a group of scientist friends navigating work, friendship, and romance with plenty of nerdy humor. The series carries a TV-14 rating across its run, driven mainly by frequent sexual innuendo, mild profanity, and recurring adult storylines that are aimed squarely at a grown-up audience.
Best suited for teens 14 and up; the humor and references are written for adults and the romantic content is persistent across all 12 seasons.
Episodes to know about
The pilot opens with a sperm bank discussion and includes explicit references to masturbation and 'mating'; sets the tone for the show's ongoing adult humor from the very first scene.
Howard's habit of aggressively hitting on women, especially Penny, is played as comedy across the early seasons before the character gradually matures.
Multiple episodes across all seasons revolve around characters trying to initiate or manage sexual relationships; no explicit content is shown but the dialogue is frank and adult.