Fifty Shades of Grey—an erotic R-rated movie based on the best-selling novel by E.L. James—brought in almost $9 million on Thursday and $30 million on Friday, according to Box Office Mojo, which could make it the highest-grossing February debut in history.
MORE: Fifty Shades of Grey Star Eloise Mumford: I Would Never Make a Film That Didn’t Empower Women
Movie experts are predicting that Fifty Shades, which features a sexually explicit relationship between a college student and a business mogul, will gross $91 million over a four-day stretch, surpassing the R-rated movie Passion of the Christ, which debuted in February 2004 and made $84 million.
It also could become the highest-grossing R-rated debut of all-time. Matrix Reloaded currently holds the top spot with almost $92 million made in its opening weekend in 2003.
Fifty Shades of Grey: TIME's Exclusive Portraits of the Cast and Director
![Dakota Johnson (Anastasia “Ana” Steele) and Jamie Dornan (Christian Grey) photographed at the Chateau Marmont in Los Angeles on Jan. 13, 2015.](https://api.time.com/wp-content/uploads/2015/02/jamie-dakota-fifty-shades.jpg?quality=75&w=2400)
![dakota Johnson (anastasia “ana” steele) photographed at the chateau marmont in los angeles, ca on january 13th, 2015.](https://api.time.com/wp-content/uploads/2015/02/dakota-fifty-shades.jpg?quality=75&w=2400)
![sam taylor-johnson (director) photographed at the chateau marmont in los angeles, ca on january 13th, 2015.](https://api.time.com/wp-content/uploads/2015/02/sam-taylor-johnson.jpg?quality=75&w=2400)
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