John Cena revealed truth behind his sex scene with Amy Schumer after she joked he was 'actually inside her'

John Cena opened up about what really went down between him and Amy Schumer when they filmed an awkward sex scene.

According to his comedic co-star, they both got ridiculously close for comfort while shooting the 2015 romcom Trainwreck - and she claimed the moment was as real as it looked.

Take a look at the trailer here:

Schumer went as far to say that Cena was 'actually inside' of her when they were feigning fornication in the film - and whether she was joking or not, the rumour mill obviously went into overdrive.

And considering the fact that the WWE wrestler was in a relationship with Nikki Bella at the time, he didn't really have a choice in addressing the matter, which is why he set the record straight about what actually went on with him and Schumer when they shot the cringing sex scene in February last year.

During an appearance on The Howard Stern Show, Cena opened up about how he ended up starring opposite the comedian.

He took on the role of gym-addict Steven in the movie which follows Schumer's 'commitment-phobic' character Amy as she ends up falling in love for the first time.

The hilarious sex scene wasn't as authentic as it appeared despite Schumer's previous claims (Universal Pictures)

She's in a relationship with fitness fanatic Steven at the start of Trainwreck, so Schumer and Cena had to act out an an intimate scene.

It's the opposite of sexy, though - as Steven simply can't get protein and working out off his mind when Amy asks him to 'talk dirty' to her.

And while chatting to Stern, the professional wrestler reassured fans he was wearing a modesty pouch to cover his manhood during the sex scene.

Describing it as a 'Spandex sock', Cena said that Schumer and the film's director, Judd Apatow, went above and beyond to make sure he felt comfortable filming the intimate moment.

He explained that they initially cleared the room so that he didn't feel intimidated, however, Cena 'didn't care' about stripping off anyway.

I mean, this is a guy who presented an award at last year's Oscars while apparently 'completely starkers' - so a closed movie set should have been a doddle for him.

Cena starred alongside the comedian in the 2015 romcom (Universal Pictures)

"That scene started with a camera operator, focus puller and a boom guy...by the end of the scene, they had catering set up in there, everybody was in there," Cena joked. "But I think the more comfortable you can be with it, the more you lose yourself in the thing."

He revealed that the inspiration for the hilarious sex scene had come directly from Schumer's real life, as she once had 'sex with a guy who was way to athletic for her'.

Discussing why he took on the role despite previously telling Stern he 'wasn't going to become an actor', Cena said he came to some major realisations in and around 2015.

He explained that he reckoned his body had another five years left in the tank for WWE, even though he would have probably tried to 'stretch it into ten'.

"That's a blink of an eye in the WWE." Cena said. "You're on the road so much, you blink your eye and a decade goes by."

He added that he realised wrestling isn't something that he can do forever, while acting gave him a creative outlet which his wrestling character had somewhat restricted.

"I had complete creative freedom over how I could curate my character, but I couldn't like turn bad - that limits what you're capable of," he said of his WWE persona.

"Playing the same character over and over again for 15 years, every week without an off season - I still love it, that's why I go back.

"But then someone gives you an opportunity of like, 'Do you want to be this weird, awkward naked guy?'"

And when someone presents you with an opportunity like that, you've got to grab it with both hands, according to Cena.