No Strings Attached (2011)
Ashton Kutcher and Natalie Portman are a pair of pals who
decide to use one another to fulfill their biological urges by becoming
"sex friends" in the romantic comedy No Strings Attached (2010).
Luckily, Natalie's clothes don't stay attached either and we get to see Ms.
Portman's rear porthole for the second time in her career after she gets nailed
by Ashton. Naughty Natalie!