Let me check my notes. The name of this one is “No Strings Attached,” and it also stars Ashton Kutcher, a perfectly nice-looking fellow and an old hand at this kind of thing. His character, a television writer named Adam, is described as “sooo tall” and “almost annoyingly happy,” which pretty much captures Mr. Kutcher’s salient traits.

Ms. Portman, playing Emma, a Los Angeles doctor who works emergency room rotations, is quite a bit smaller and more emotionally complicated. What are these two doing together? A possible solution to the mystery emerges if you recall a particular scene involving Mila Kunis in “Black Swan.” Ms. Portman can now claim what appears to be a unique distinction: She may be the only Golden Globe-winning actress to simulate sex on screen with two former members of the cast of “That ’70s Show.”

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