What I saw in Shortbus is that it is all about being human. This movie deals with feelings, hardships, love, sex, relationships, and struggles to find a balance between those.
It strikes me a bit after some searches on the web that many people consider this movie as unusual, off-limits or even pornographic. Nonsense! Shortbus is about real life, the one you can see when you open your eyes and look around you.
My favourite character is Caleb. Maybe because Peter Stickles is gorgeous, or maybe because I identify with the role.