Ryan Reynolds 'forgot his lines' after co-star stripped off whilst filming NSFW sex scene

Whilst one might expect A-list stars to maintain their professionalism whilst filming sex scenes, Ryan Reynolds recently dropped the bombshell that one intimate moment he filmed with co-star Olivia Wilde left him lost for words.

Literally... the actor claimed the scene left him so blown away that he forgot all of his lines.

Despite being, first and foremost, a comedy movie, 2011 blockbuster The Change-Up does have its fair share of raunchy moments.

Telling the tale of two dissatisfied besties, the film sees Reynolds' character Mitch and co-lead Jason Bateman's character Dave, magically 'switch bodies' after admitting they wish they had one another's lives.

Not only does this see the duo taking over each other's jobs, but getting into saucy situations with each other's love interests.

Enter Olivia Wilde, who plays Dave's seductive assistant who Mitch has a crush on.

Eventually, the real Mitch - played by Reynolds - and Sabrina wind up getting intimate together.

Reynolds recently revealed, however, said that the actual filming of the scene was far from sexual, and a blooper saw him accidentally fondling co-star Wilde's breasts.

Reynolds claims he's still haunted by the blunder (Universal)

"So, in the scene, she’s sitting there and I take her top off and the bra off, and she has those pasties on," he recently told press.

"But she’s drawn these adorable little smiley faces on them, and I forget every line in the scene — not just from this movie but from every other movie I’ve done."

The father-of-four - who is married to fellow actress Blake Lively in real life - added: "At some point in the scene she takes my hands and puts them on her breasts.

"So, they’re there. Palms (are) a little sweaty. I don’t know what’s happening… And I’m trying not to look at her like a 14-year-old boy that just won the lady lottery."

Reynolds, 48, went on to recall: "I take my hands away and I look down at my hands and there’s two frickin’ smiley faces on them and I have no idea what to do.

The scene also involved Olivia Wilde (Universal)

"The scene is over now. And I reflexively, like an idiot, just put my hands right back on her breasts."

Attempting to alleviate the situation, he added: "And I think I’m doing it to cover them up, but I’m realising now that it’s a very fine line between chivalry and, you know, workplace sexual assault."

Yep, there's no denying it. That is awkward.