When Ben Wrightman, a young teacher, begins dating pretty businesswoman Lindsey Meeks, the two don't seem to have a lot of the same interests, but they fall in love, regardless. Their romance goes well until baseball season begins, and Lindsey soon realizes that Ben is completely obsessed with the Boston Red Sox. Though she tries to understand Ben's passionate team loyalty, eventually it threatens to end their otherwise happy relationship.
Disillusioned with romance, Beth, an ambitious New Yorker, travels to Rome for her sister's wedding, where she plucks magic coins from a special fountain of love. The coins attract unwanted attention from an assortment of odd yet ardent suitors: a sausage merchant, a street magician, an artist, and a male model. But when the best man from the wedding, persistent reporter Nick, throws his hat in the ring, Beth wonders if his love is the real thing.
On the first day at his new school, Cameron instantly falls for Bianca, the gorgeous girl of his dreams. The only problem is that Bianca is forbidden to date until her ill-tempered, completely un-dateable older sister Kat goes out, too. In an attempt to solve his problem, Cameron singles out the only guy who could possibly be a match for Kat: a mysterious bad boy with a nasty reputation of his own.
Eight London couples try to deal with their relationships in different ways. Their tryst with love makes them discover how complicated relationships can be.
William Thacker is a London bookstore owner whose humdrum existence is thrown into romantic turmoil when famous American actress Anna Scott appears in his shop. A chance encounter over spilled orange juice leads to a kiss that blossoms into a full-blown affair. As the average bloke and glamorous movie star draw closer and closer together, they struggle to reconcile their radically different lifestyles in the name of love.
While on a business trip in Los Angeles, Edward Lewis, a millionaire entrepreneur who makes a living buying and breaking up companies, picks up a prostitute, Vivian, while asking for directions; after, Edward hires Vivian to stay with him for the weekend to accompany him to a few social events, and the two get closer only to discover there are significant hurdles to overcome as they try to bridge the gap between their very different worlds.
During her wedding ceremony, Rachel notices Luce in the audience and feels instantly drawn to her. The two women become close friends, and when Rachel learns that Luce is a lesbian, she realizes that despite her happy marriage to Heck, she is falling for Luce. As she questions her sexual orientation, Rachel must decide between her stable relationship with Heck and her exhilarating new romance with Luce.
Melvin Udall, a cranky, bigoted, obsessive-compulsive writer of romantic fiction, is rude to everyone he meets, including his gay neighbor, Simon. After Simon is brutally attacked and hospitalized, Melvin finds his life turned upside down when he has to look after Simon's dog. In addition, Carol, the only waitress at the local diner who will tolerate him, leaves work to care for her chronically ill son, making it impossible for Melvin to eat breakfast.
Dedicated environmental lawyer Lucy Kelson goes to work for billionaire George Wade as part of a deal to preserve a community center. Indecisive and weak-willed George grows dependent on Lucy's guidance on everything from legal matters to clothing. Exasperated, Lucy gives notice and picks Harvard graduate June Carter as her replacement. As Lucy's time at the firm nears an end, she grows jealous of June and has second thoughts about leaving George.
After the death of his mother, a young boy calls a radio station in an attempt to set his father up on a date. Talking about his father’s loneliness soon leads to a meeting with a young female journalist, who has flown to Seattle to write a story about the boy and his father.