"Sex is No Laughing Matter" or "Don't Laugh at My Romance", whatever you want to call it, is a fairly standard movie. The performances by Hiromi Nagasaki(Yuri) and Ken'ichi Matsuyama(Mirume)are good but nothing spectacular. I honestly didn't care much about those characters or their storyline and I thought that the more interesting subplot was the relationship between Mirume and En-Chan played by the always brilliant, Yu Aoi. Mirume and Yuri's affair has a devastating impact on the heartbroken En-Chan, who becomes jealous when she finds out that her secret love has fallen for an older woman. She plays the part of the forlorn college student to a tee and is the main reason for any success the film achieves. I've got to say that after "Hana & Alice", this is the funniest performance of Yu Aoi's that I've seen yet and really showcases her comedic talent. There's a very hilarious and endearing scene between Shugo Oshinari(Domoto) and Yu Aoi's character at the end of the film that is just about as good as it gets from a comedic standpoint. For those of you who don't know, Yu and Shugo played the characters of Tsuda and Hoshino in the film "All About Lily Chou Chou", where in that movie, Shugo actually played Yu's pimp. It's both odd and nostalgic to see those two act together in "Don't Laugh at My Romance" knowing what their characters went through in the previous film. To sum everything up, I would recommend this movie to Japanese film lovers, but this is a must-see if you're a Yu Aoi fan.