In an interview with Nylon, the actress claimed that director Zack Snyder was forced to cut the footage following pressure by the Motion Picture Association of America.
"I had a very tame and mild love scene with Jon Hamm. It was like heavy breathing and making out," she explained.
"It was hardly a sex scene... I think that it's great for this young girl to actually take control of her own sexuality. Well, the MPAA doesn't like that. They don't think a girl should ever be in control of her own sexuality because they're from the Stone Age."
She continued: "I don't know what the f**k is going on and I will openly criticise it, happily. So essentially, they got Zack to edit the scene and make it look less like she's into it.
"And Zack said he edited it down to the point where it looked like he was taking advantage of her. That's the only way he could get a PG-13 (rating) and he said, 'I don't want to send that message.' So they cut the scene!"
Browning previously said that she and her Sucker Punch co-stars bonded intensely during filming.
Deborah Snyder recently revealed that the film was initially meant to be released in 3D but the plan was axed when she and her husband were unhappy with the results.