This Morning viewers were left flabbergasted after Dr Zoe explained the X-rated meaning behind the name of new ITV drama The Singapore Grip.

Holly Willoughby and Phillip Schofield had been interviewing David Morrissey, who plays Walter Blackett in the WWII drama.

But the pair went on to probe the actor on the meaning of the name, which he insisted he didn't know.

Thankfully, Dr Zoe was on hand to explain what the "Singapore grip" means.

She said: "The Singapore grip is a sexual technique which involves the woman using her vagina muscles to stimulate a man's penis during intercourse when they both remain stationary."

Switching back to Phil in the studio, he told David: "So you're quite happy that you don't have to explain that."

"Wow," David said. "Is that in episode three?"

Holly and Phil laughed as he added: "I haven't got there yet!"

And viewers were stunned by the revelation, with one tweeting: "Bloody hell I might need to catch up on this Singapore Grip. I didn't realise it was some pervy sex mad program #ThisMorning."

While another commented: "There was me thinking it was an economic term #ThisMorning #singaporegrip."

A third wrote: "@thismorning @DrZoeWilliams a true professional. How she explained the Singapore Grip with a straight face,I don't know! Not even a smirk! @Schofe @hollywills #ThisMorning."

"#ThisMorning Blimey, you’d really have to concentrate on your pelvic floor for that one," another quipped.

One exclaimed: "That went a bit x rated! #ThisMorning."

*This Morning airs weekdays at 10am on ITV