I have been lamenting deciding to read "Murder List" recently. It is more romance than murder. But, it did have a funny line in it. I have never heard this before but I don't know if the author made it up.
Regan (girl): [To a guy friend in college that was quite a ladies man.] Why can't you stick with one women at a time? Have a relationship.
Guy: Because girls are like potato chips.
Regan: How's that?
Guy: You can't eat just one.