Sex, terror and Sherlock Holmes

“And still they gazed and still the wonder grew". Was an accidentally prescient Oliver Goldsmith unwittingly describing how many viewers must feel about couples who take their sexual problems out of the bedroom and onto the television?

And then there's that other rather more modern quote, usually from some know-all TV sex mechanic: “Have you ever tied each other up?”

Bondage seems to be the answer in virtually all of these programmes, the ...