The Fifty Shades train keeps rolling along.

For the third straight week, the preview for the movie adaptation of Fifty Shades of Grey, EL James’ bestselling erotic romance novel, was the most-viewed trailer on YouTube, according to technology firm Zefr which tracks the numbers.

The movie, starring Jamie Dornan and Dakota Johnson, notched 4.2 million views for the week ending Sept. 8. Its cumulative total now stands at 63.7 million views in the seven weeks since it’s July 24 release. The movie arrives in theaters Valentine’s Day weekend 2015.

The second most-viewed trailer was Seventh Son’s trailer No. 2, which managed to nab 3.7 million views in its debut week.