Channel 4 drama The Couple Next Door features plenty of sex and swinging.
But would you know if your neighbours were swingers? Here's the signs that show they may be hiding a saucy secret.
Pampas grass sales plummeted after it was revealed to be a swingers' sign. Broadcaster Mariella Frostrup said she was inundated with unwanted enquiries after planting it outside her home
According to alternative lifestyle website Bigger Love, pineapple door knockers are a secret symbol that the residents are swingers - especially if they're upside down.
They may look sweet and innocent, but it turns out "quirky" garden statues like gnomes and flamingos can also indicate there is a swinger in the midst.
A hot tub is an amazing way to relax or socialise - but it could also indicate you're looking for a little more "risque" fun too.