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I don't know that sex always has to have feelings, but I think that friendship always does.

"NO STRINGS ATTACHED Interview with Natalie Portman, Ashton Kutcher, Director Ivan Reitman and Screenwriter Liz Meriwether". Press conference, collider.com. January 19, 2011.
I don't know that sex always has to have feelings, but I think that friendship always does.