LOS ANGELES -- Audiences weren't afraid of committing to "No Strings Attached," making it the No. 1 movie at the box office in its opening weekend.
The romantic comedy from Paramount Pictures earned an estimated $20.3 million, according to studio estimates Sunday.
Ashton Kutcher and Natalie Portman star as friends who try to maintain a purely sexual relationship with each other, even as they find they're falling in love.
Last week's No. 1 movie, Columbia Pictures' action comedy "The Green Hornet," dropped to second place with $18.1 million.
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