The Doctor Foster actress, 40, said show writer Sally Wainwright hired intimacy co-ordinator Ita O’Brien to give advice on how to behave convincingly.
She said: “I was quite nervous about the sex scenes we had to do, because I thought they should be approached as sensitively as they could be.
“One of the great things she brought was an articulacy – we could talk about the scenes.
"She just started talking about body parts and positions in a matter of fact way, which just liberated us all.
“As well as helping us sculpt the sex scenes, the positions, she’s also there to provide support to the artists.”
O’Brien advises that sex scenes are carefully worked out in advance, saying: “Fight scenes in films are carefully choreographed and rehearsed. Sex scenes should be the same.”
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