UNITED NEWS INTERNATIONAL (UNI) — “Fifty Shades Freed” is steaming up the box office.

The final installment of the kinky “Fifty Shades” trilogy — which is being marketed under the tagline “don’t miss the climax” — finished in first place over its opening weekend.

It whipped the competition and seduced moviegoers into spending $137 million worldwide over the pre-Valentine’s Day weekend.

That’s enough to push the franchise over $1 billion globally.

Audiences are largely young and overwhelmingly female, but Universal’s president of domestic distribution says “Fifty Shades Freed” is playing well across the United States.

Lovers Christian Grey and Anastasia Steele get married in the final chapter, which — you won’t be surprised to learn — is rated “R” in the U.S. for sexual content and nudity.

On the opposite end of the movie-going spectrum, however, Sony’s “Peter Rabbit” hopped its way to a No. 2 Debut in North America.