A plot element involves a photograph of several naked people in bed together. The image on the photograph is seen by viewers in at least one episode, and is referenced and discussed in others.

George Smiley (Alec Guinness) visits a sex club while seeking out a contact for information. Smiley does not engage in any sexual activity and appears to be disinterested in the goings-on around him, but many naked sex workers are shown over the course of several minutes, some of whom engage in sado-masochistic theatrics in front of an audience.

Showed dead body in episode 1, Showed gagged, tied up and beaten dead body Ep 3?

Smoking and Drinking play role through out