According to the study, by far the most popular position - adopted by 34% of couples - is one known as the ”Separation.”
This is where you sleep facing apart – with a space inbetween.
While this can be a good thing and indicates a couple in a secure relationship who don’t feel the need to show affection in their sleeping posture, it is also the most popular position when one partner is being unfaithful.
That is because the adulterer is wary of getting too close to their spouse in bed in case tell-tale signs of cheating such as the smell of another person’s perfume or aftershave are evident.
The second most popular sleeping position is the Back Kisser - used by 22% of couples.
They again sleep with their backs facing each other but maintain greater intimacy than the Separation by touching backs and sometimes maintaining contact through their feet. You can be close but still get a good night's sleep.
The third most popular position is the Spoon - this is by far the most popular position for couples in new relationships with almost half (48%) saying they use it when they first make love. However, only 16% of couples use it when they are in an established relationship because of difficulty sleeping.
The fourth most popular position is the Space Hog - picked by 14% of respondents.
This is where one partner, typically the male, hogs a large part of the bed and their partner has to be accommodated around them.
The most popular sleeping positions were revealed in a new poll by IllicitEncounters.com, the UK’s leading website for married people.
The fifth most popular position was the Nuzzle - another position for new lovers which is only used by 8% of couples in settled relationships. The couple is close and the female rests her head on his chest.
Tangled is the sixth most popular position where both bodies are completely entwined - popular with new lovers but used by only 6% of couples in long-term relationships due to difficulty sleeping.
IllicitEncounters.com sex and relationship expert Jessica Leoni said: “When we sleep, our subconscious minds take over, so the body language we use with a partner can be a precise gauge of what is going on in a relationship.
“Couples in South Yorkshire tend to be quite intimate in how they sleep when they first together and then gradually drift apart in bed over time.
“This is not necessarily a bad thing - if the relationship is secure you should not need to prove your intimacy by adopting sleep positions which are uncomfortable and make it impossible to drop off.
“The one red flag for anyone should be if you normally share a quite intimate sleeping position with your partner and then they suddenly switch to the Separation position.
“This is a sign that they are up to no good and are worried that signs of their betrayal are evident on their body or they are thinking about another person and spurning intimacy with you. Other signs to look out for are them showering or cleaning their teeth as soon as they come in.”
IllicitEncounters.com has registered more than one million members in the UK since its inception 16 years ago.
The six most popular sleep positions for couples
1 The Separation - chosen by 34% of couples
2 Back Kissers - chosen by 22% of couples
3 Spoon - chosen by 16% of couples
4 Space Hog - chosen by 14% of couples
5 Nuzzle - chosen by 8% of couples
6 Tangled - chosen by 6% of couples