It is about love (maybe not the love you think about)
I read a lot of complaints about this movie stating that it is not about love, but I see it a different way (and I love this movie) It is not about cookie cutter love but about all different types of love
Unrequited love, Juliet and Mark, Sarah and Karl, Mia and Henry
Sex based love, (plus for laughs)The Collin story line
Non sex based love: Jack and Just Judy the sex part is already there due to the job they have but now they have met someone that they can connect with in a nonsexual way.
Young love, Sammy and Joanna
New love, Jamie and Aurelia , David and Natalie
Old love, Daniel and Joanna (wife) Karen and Henry
Love between fiends, Mostly Billy and Joe
Infidelity with love, Henry and Karen
Love of family Sammy and Daniel, Sarah and her brother
Sacrificial love, Sarah and her brother
Love with grief, Daniel and Sammy and Joanna(mother)
So it is about love in its many forms