I remember my parents having this absolutely adorable plaque-type thing with the 'Love is..' cartoon on it. I dug around a little (God bless Google) and found the info needed on Wikipedia (God bless Wiki as well). Turns out the comic strip was created by a NZ babe called Kim Grove who got the idea from making love notes for her husband. After her death, her son Stefano Casali continued the strip.
I think the most appealing part of the strip is the simplicity of the message and the fact that it makes one smile regardless of age or gender. I also love that the 2 main protagonists are adorably naked but obviously adult :)
For those who liked it, the official website is http://www.gocomics.com/loveis/