This is a big issue for me because I started writing when I was pretty young; I remember being terrified that my mom would look over my shoulder and spot the well placed "Damn!" I had hidden in-between dialogue. I found this actually seemed to plug up my creative juices, so to speak - there were intense moments in my writing when cursing would be a perfectly natural response, or even ramp up the action. Imagine a character who is very reserved sobbing over a loved one's death while cursing out the person who killed them! How impactful! Despite this, I still can't make myself step over the line. I try to write my book like a PG-13 movie; damn, hell, bitch, bastard, etc. are acceptable and can be used liberally, while limiting myself to three s-words, and if the time is right, one f-word. However, as I'm delving into a more adult world of writing, I'm still afraid of using profanity. How do you use it when you write? Do you follow any "rules" like I do? *EDIT*- as an addendum, I'd like to add that I fear that profanity would alienate my beta readers; they're usually friends of mine and might be shocked by it; I don't curse, myself.