If you've seen "No Strings Attached" you've seen this movie---the two are so parallel they're not so much like book ends, but one bookend split in two.
This one takes place in New York City, and is yet another film that makes what was not so long ago America's version of Hell look as pretty as Paris (think about it, NYC was once the setting for films like "Taxi Driver"). Here, both characters are on the rebound, which in most movies would have them avoiding relationships. In this instance they decide to have a sexual relationship without entanglements. Woody Harrelson plays a humorous gay character, and of course in many ways what the main characters are doing is having a gay relationship, since the idea of pregnancy or any other serious consequences never comes up. A lot of historic characters had such relationships: Don Juan comes to mind. Baron Von Munchausen even flirted with the Queen of The Moon, and turned down the hand of Catherine The Great. But those were love affairs of men.
It's the 21st Century, so Hollywood has given us two young adults (four if you count "No Strings Attached") where the man is everything polls tell us women want, yet the woman doesn't want anything more from him than sex. Well, of course, they fall in love by the end of the film and everything gets messed up, but what can I say? No spoilers here.
Fast moving, at times scenic, quite contemporary (meaning that in the future it will be interesting to watch for it's depiction of our times, flash mobs and the like) and sexy without being erotic, it's no "Sex and Lucia", not by a long shot. This is your rainy day movie, or something to pick you up when you haven't the energy to watch something that requires your brain.
And yes, the kids look gorgeous nearly naked.