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
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