This romantic comedy is about artificial insemination and what it means to know who the sperm donor really is. Jennifer Aniston plays Kassie Larsen, a woman in her thirties that does not have a husband or boyfriend, but decides she wants to have a baby on her own. Her best friend is a character Wally Mars (played by Jason Bateman). Wally tries to talk Kassie out of going through with her plans. But Kassie will not be dissuaded. Not only does she make arrangements for artificial insemination but she also wants to know who the donor is. Wally offers to donate sperm but Kassie thinks he has too many neurosis and also since they are best friends it would be uncomfortable. Wally tried dating Kassie before but it did not work out. He still loves her. She gets a married guy Roland (played by Patrick Wilson) that she knows to agree to donate the sperm. He is an intelligent, handsome, tall guy that she thinks would be the perfect guy with the best genes possible so she can have a super baby.
Kassie throws a party to invite all her friends on the night when Roland will donate his sperm. She gives Roland a cup so he can collect his sperm in the bathroom. Wally meets Roland at the party. He hates him. He is jealous of him and upset that Kassie thinks he is the better donor. Wally gets drunk and high on pills. After Roland does his thing in the bathroom, Wally enters. wally sees the cup that Roland left behind, fumbles with it in his drunken stupor and drops the contents down the sink. Not knowing what else to do, he replaces the missing sperm with his own. The next day he is completely hung over, having no recollection at all of what he did.
Kassie successfully has a baby. Kassie moves to the Midwest to have a better environment for raising a child than New York leaving Wally behind. Kassie returns to New York many years after that with her son Sebastian (played by Thomas Robinson). When Wally meets Sebastian there is a eerie similarity between them. They get along very well. Roland has since become divorced and Kassie starts dating him thinking since he is the father of her son, they could make a go of it. Roland and Sebastian are very different and they don't get along very well. But Roland likes Kassie so he proposes to her. Wally figures out what he did after he realizes how similar Sebastian is to him. Wally tells Kassie what he did which makes her furious and she breaks off the friendship.
After a while Kassie realizes that her son Sebastian really needs Wally and she does also. She breaks up with Roland without getting married. Wally, Kassie, and Sebastian all find out, they can make a family together after all.
Best part of story, including ending:
It is amazing what people will do when they are so drunk and that they can completely forget what happened.
Best scene in story:
When Wally meets Sebastian he sees all of his neurotic behavior in the boy which is how he recognizes him as his son.
Opinion about the main character:
Wally is a messed-up guy with many problems, but he does love both Kassie and the son he fathered which makes him likeable in the end.